Question

calculate the increase in potential energy as a block of 2 kg is lifted up through 2m

Answer 1

Given that,  M = 2 kgheight h = 2 m When the block is at ground, its initial potential energy is zero. When the block is lifted upto 2 m height potential energy increases. 
Increase in P.E
= mgh       
= 2 x 2 x 9.8       
= 39.2 J

Answer 2

Answer:

Given,

m=2kg

h=2m

g=10m/s²

Potential energy =mgh

=(2kg)(10m/s²)(2m)

=40J