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

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

A) 625 N
B) 1250 N
C) 500 N
D) 0 N