Question

A body of mass 10kg projected vertically up with 20m/s velocity what will be its PE when its velocity is half of its initial value?​

Answer 1

Answer:

1500 J

Explanation:

initial velocity= 20m/s

Final velocity= 10 m/s

m= 10 kg

As we know,

P.E= mgh

therefore we need to find h.

Using equation of motion,

V2 - U2 = -2gh

we get,

h = 15 m

Plugging in the value of h,

P.E = 10 X 10 X 15

= 1500J

I hope you understand.....

Answer 2

Answer:

500J

Explanation:

Loss in kinetic energy = Gain in p.e

final v = 10 m/s

loss in k.e = 1/2*mv^2 = 1/2*10*(20-10)^2 = 500J