Question

A football player kicks a 0.5 kg ball and imparts it a velocity of 10 m/s. The contact between foot and ball is only for 1/50th of a second. The kicking force is?

• A. 3.78 N
• B. 250 N
• C. 125 N
• D. 0 N

Answer 1

The correct option is B 250 N

The ball was originally at rest.
∴ Change in linear momentum $=0.5\times 10kgm/s$
= 5 kg m/s
Impulse = Change in linear momentum
$F\times t=5$
$\Rightarrow F\times \frac{1}{50}=5$
$\Rightarrow F=5\times 50=250N$