# a ball is thrown vertically upwards with a velocity u

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## A ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u , the time taken by the ball to reach the ground is

Click here👆to get an answer to your question ✍️ A ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u , the time taken by the ball to reach the ground is

Question

## A ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u, the time taken by the ball to reach the ground is

**A**

g u

**B**

g 2u

**C**

g 3u

**D**

g 4u Hard Open in App Solution Verified by Toppr

Correct option is D)

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## A ball is thrown vertically upward with a velocity u frif the top of the tower .if it strikes the ground with a velocity 3 u the time taken by the ball to reach the ground is and in terms of u is required

A ball is thrown vertically upward with a velocity u frif the top of the tower .if it strikes the ground with a velocity 3 u the time taken by the ball to reach the ground is and in terms of u is required

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A ball is thrown vertically upward with a velocity u frif the top of the tower .if it strikes the ground with a velocity 3 u the time taken by the ball to reach the ground is and in terms of u is required

Question

A ball is thrown vertically upward with a velocity u frif the top of the tower .if it strikes the ground with a velocity 3u the time taken by the ball to reach the ground is and in terms of u is required

Open in App Solution

initial velocity = u =-u

final velocity = v = 3u

acceleration due to gravity = g

v = u + gt 3u = -u + gt 3u+u/g = t 4u/g = t Suggest Corrections 10

SIMILAR QUESTIONS

**Q.**A ball is thrown vertically upward with a velocity

μ

from the top of a tower. If it strikes the ground with velocity

3 μ

, the time taken by the ball to reach the ground is:

**Q.**A ball is thrown vertically downward with a velocity

u

from the top of a tower. It strikes the ground with a velocity

3 u

. The time taken by the ball to reach the ground is given by

**Q.**A ball is thrown vertically downward with a velocity

u

from the top of a tower. It strikes the ground with a velocity

5 u

. The time taken by the ball to reach the ground is given by

**Q.**A stone is thrown vertically upward with an initial velocity

u

from the top of a tower, reaches the ground with a velocity

3 u

. The height of the tower is

## A ball is thrown vertically upwards with velocity u class 11 physics CBSE

A ball is thrown vertically upwards with velocity u the speed with which it falls to the world again is

## A ball is thrown vertically upwards with velocity ‘u’. the speed with which it falls to the world again is:

Answer Verified 158.4k+ views

**Hint:**The speed of an object is the rate of change of its position with reference to a frame of reference, and may be a function of your time . Velocity is like a specification of an object's speed and direction of motion.

**Complete step by step solution:**

For vertically upward motion: g is negative because it opposes the motion.

v = u – gt 0 = u – gt t = u/g …..(1)

For vertically downward motion: g is positive because it is within the direction of motion.

v = u + gt v = 0 + gt t = v/g …..(2)

From equation 1 and a couple of

v = u

When one throws a ball upwards with velocity 'u' its velocity decreases thanks to downward gravitational pull. it'll reach some extent where its velocity becomes zero.

Let the time taken by the ball to subside from a height be 't'.

Using,v=u+gt.

For example, when a ball is thrown up within the air, the ball's velocity is initially upward. Since gravity pulls the thing toward the world with a continuing acceleration g, the magnitude of velocity decreases because the ball approaches maximum height. At the very best point in its trajectory, the ball has zero velocity, and therefore the magnitude of velocity increases again because the ball falls back toward the ground.

**Note:**

PE= MGh, which shows that P.E. is directly proportional to height, hence as height increases, P.E. increases. Once we throw a ball upwards, its speed retards gradually. This is often because the world produces gravity which brings down everything that goes up. So when a ball is thrown upward the gravity applies force to bring it down which decreases its speed of rising.

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