- #1
fomenkoa
- 47
- 0
This seems easy but I'm not getting the right answer!
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
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