Question

a body of mas 1.5kg is thrown vertically upwards with an initial velocity of 15m/s what will be its potential energy at the end of 2sec

Answer 1

g=-10 as a


s=1/2at^2+ut
s=1/2*-10*2^2+15*2
s=10m

p.e= mgh
= 10*1.5*10
=150J

  

Answer 2

u=15m/s
m=1.5kg
t=2s

s=ut+1/2at²
 =15(2)+1/2×-10×4
 =30-20
 =10m

p.e=mgh
     =1.5×10×10
     =150J