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## Homework Statement

A spring is compressed 1.5 cm and propels a 49g toy to a height of 45 cm.

a. Find the spring constant

b. The average power of the spring during propulsion.

c. The instantaneous power exerted when the compression is just .75cm

## Homework Equations

k=F/[tex]\Delta[/tex]x

Power=Work/time

## The Attempt at a Solution

i thought the spring constant ,k, would be (mass of toy x 9.81)/(.015), but this is wrong.

then work would be, force(which i don't know how to find) x distance(.45).. but im not sure