Question

If a body of mass 200 g falls from a height 200 m and its total pe is converted inti ke at the point of contact of the body with earth surface then what is the decrease in pe of the body at the contract

Answer 1

Answer: -400J

Explanation:The potential energy of the body at the point of contact will be zero as h= 0. So the decrease in potential energy will be equal to the initial potential energy of the body which is given by :

M = 200/1000 = 0.2kg

H = 200m (at initial position )

h = 0m (at point of contact)

g = 10 m/s^2

Change in P.E. = final p.e - intial p.e

= Mgh - MgH

= 0 - (0.2*10*200)

= -400J

Answer 2

Answer:

400 j

Explanation:

0.2x10x200 = 400 j