Verified Solution • 2025–26 Session moderate

QJEEM21Phe11c: JEE Main 2021 Physics - Class 11 JEEM21Phe11c Solution: A boy is rolling a 0.5 kg ball on the frictionless floor with…

A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 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?

Multiple Choice Options

  • A 14.41 ms−1
  • B 19.0 ms−1
  • C 4.47 ms−1
  • D 1.00 ms−1

Step-by-Step Verified Solution

K.E.f=5%KEi

12mv2=5100×12×m×202

v2=120×202=20

v=20=25 m/s

= 4.47 m/s

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