Question

A body of mass 8 kg is at rest on the horizontal plane. Applying the horizontal force, the body moves 50 m, acquiring a speed of 40 m / s at the end of that shift. What is the value of the work done on the body?

Answer 1

f=ma
f=8 x v-u
        t
v=40 ,u=0
velocity=displacement
                     time
time=displacement
           velocity
t=50
   40
=5/4 sec
a=40-0
     5/4
=40 x 4
         5
=32m/s²
w=8x32=256
⇒w=32