Question

calculate the work done on the foot ball to attain a velocity of 15m/s from rest if itd mass is 0.4 kg​

Answer 1

Answer:

$velocity = 15m|s \\ mass =0 .4kg = \frac{4}{10} kg \\ \\ work \: done = \frac{1}{2} m {v}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{1}{2} \times \frac{4}{10} \times 15 \times 15 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 45joule$

Answer 2

Answer:

Given that initial velocity (u) =0m/s

let Final velocity (v) =15m/s

mass of the football =0.4kg

work done =1/2mv^2

=1/2*4/10*15 *15

=45 J