A boy is rolling | Work, Energy and Power

JEE_MAIN_2021

170321_S1

Question

A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of $20 \mathrm{~ms}^{-1}$. The ball gets deflected by an obstacle on the way. After deflection it moves with 5\% of its initial kinetic energy. What is the speed of the ball now ?

Select the correct option:

$19.0 \mathrm{~ms}^{-1}$

$4.47 \mathrm{~ms}^{-1}$

$14.41 \mathrm{~ms}^{-1}$

$1.00 \mathrm{~ms}^{-1}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution