A boy throws a ball to his friend 20 m away- The ball reaches to the friend in 4 s- The friend then throws the ball back to boy and it reaches the boy in 5 s- Assume the ball travels with constant velocity during any throw-A- The average velocity is 40-9 ms -1B- The average acceleration is zero-C- The average velocity is zero but average acceleration is non-zero-D- Average acceleration of the motion cannot be defined-

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Standard XII

Physics

Velocity in 2D

A boy throws ...

Question

A boy throws a ball to his friend $20 m$ away. The ball reaches to the friend in $4 s$ . The friend then throws the ball back to boy and it reaches the boy in $5 s$ . Assume the ball travels with constant velocity during any throw.

The average velocity is

\frac{40}{9} {ms}^{- 1}

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The average acceleration is zero.

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The average velocity is zero but average acceleration is non-zero.

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Average acceleration of the motion cannot be defined.

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Solution

The correct option is C The average velocity is zero but average acceleration is non-zero.
The net displacement of the ball is zero, hence the average velocity must be zero. But as there is change in the velocity of the ball, the average acceleration cannot be zero.

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A boy throws a ball to his friend 20 m away. The ball reaches to the friend in 4 s. The friend then throws the ball back to boy and it reaches the boy in 5 s. Assume the ball travels with constant velocity during any throw.

The correct option is C The average velocity is zero but average acceleration is non-zero.The net displacement of the ball is zero, hence the average velocity must be zero. But as there is change in the velocity of the ball, the average acceleration cannot be zero.

A boy throws a ball to his friend $20 m$ away. The ball reaches to the friend in $4 s$ . The friend then throws the ball back to boy and it reaches the boy in $5 s$ . Assume the ball travels with constant velocity during any throw.

The correct option is C The average velocity is zero but average acceleration is non-zero.
The net displacement of the ball is zero, hence the average velocity must be zero. But as there is change in the velocity of the ball, the average acceleration cannot be zero.