Laws Of Motion Question 282
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
Options:
A) 250 N
B) 1250 N
C) 500 N
D) 625 N
Show Answer
Answer:
Correct Answer: D
Solution:
[d] $ \text{Here }m=0.5kg;\text{ }u=-10m/s;$
$ [t\text{ }=\text{ }1/50s;v=+15m{{s}^{-1}}] \text{Force}=m(v-u)/t=0.5(10+15)\times 50\text{ }=625N $
