Question

A sphere of mass 4 kg is dropped from a certain height. After 5 s, its
kinetic energy is (g = 10 ms?)
1) 5 J
2) 50 J
3) 5 KJ
4) 50 KJ​

Answer 1

Answer:5KJ

Explanation:

M=4kg

t=5s

g=10m/s

Now,

We know v=u+at

V=0+10×5=50m/s

KE=1/2mv

=1/2×4×50×50

=5000J

Now,

5000/1000=5KJ