- #1

fomenkoa

- 47

- 0

The question: A 0.5 kg ball is thrown into the air. At a height of 20m above the ground, it is traveling at 15 m/s.

a)How much work was done by someone at ground level throwing the ball up into the air

Ok, for a), Work=Force x Distance

so,

W = (0.5 kg x 9.81 N/kg) x 20 m

= 98 J

But that's not the answer in my textbook! I realize my substitution for "Force" is wrong but I don't know why

Anton