Acompressed spring in a toy is used to launch a 5.00-gram ball.
if the ball leaves the toy with an initial horizontal speed of 5.00 meters per second, the minimum amount of potential energy stored in the compressed spring was:

a) 0.0125 j
b) 0.0250 j
c) 0.0625 j
d) 0.125 j

c) 0.0625 J

Explanation:

How the mechanical energy is conserved, then ball’s kinetic energy is equal to stored energy in compressed spring.

Then:

         Where K: kinetic energy

                     : elastic potential energy

K = 0.0625 J

and

   = 0.0625

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

false

hope this : d