Railways PYQCBT 1 2016

RRB NTPC · Question 100

A good cricket fielder while catching a fast moving ball moves his hand along with the ball because ______ A. he decreases the time of contact therefore increasing the force of contact. B. He increases the time of contact thereby reducing the force of contact. C. He is afraid to take the ball and thus takes his hand out. D. He decreases the time of contact therefore reducing the force of contact.

  1. C

  2. A

  3. D

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Force = change in momentum ÷ time. By moving his hands back with the ball, the fielder increases the time over which the ball stops, which reduces the force on his hands and lessens the sting.