Question

A bullet of mass 20g is found to pass two points 30m apart in a time interval of 4s. Calculate the kinetic energy of the bullet if it moves with constant speed.

(a) 2.5J

(b) 5J

(c) 0.562J

(d) 2J

I had been asked this question during an internship interview.

This question is from Collision and Friction topic in division Nature of Physical World of Engineering Physics I

Answer 1

Right answer is (c) 0.562J

The explanation: Speed, v = (Distacne )/Time = 7.5m/s

Kinetic energy = 1/2×0.02×7.5^2 = 0.5625J.