Question

A certain force acts on a body of masses 10kg and changes its velocity to 2m\s to 5m\s. Calculate work done by force

Answer 1

mass=10 kg , u =2m/s , v =5m/s
we know ,,work done =1/2 ×m (v×2 - u×2)
1/2×10(4-25)
5×(-21)
-105J

Answer 2

Mass= 10 kg
initial velocity(u)=2m/s
final velocity(v)=5m/s
work done = 1/2  x  m  x  (v^2-u^2)
=1/2 x 10 x-21
=  -105 J