Question

A player stops a football weighting 0.5 kg which comes flying towards him with a velocity of 10m/s. If the impact lasts for 1/50th sec. and the ball bounces back with a velocity of 15 m/s, then the average force involved is ______.

विकल्प

• 250 N

• 1250 N

• 500 N

• 625 N

Answer 1

A player stops a football weighting 0.5 kg which comes flying towards him with a velocity of 10m/s. If the impact lasts for 1/50th sec. and the ball bounces back with a velocity of 15 m/s, then the average force involved is 625 N.

Explanation:

Here m = 0.5 kg; u = -10 m/s:

t = 1/50 s; v = +15 ms^-1

Force = m(v - u)/t

= 0.5 (10 + 15) × 50 

= 625 N