A ball is thrown straight up with an initial speed
of 30 m/s. What is its speed after 4.2 s?
2 answers:
11.16 m/s.
Notice I'm not telling you whether that's up or down, because you only asked for the speed, which has no direction.
This would have been a great question to ask for the ball's velocity.
Answer:
vf = -11.16 m/s
Explanation:
vf = vi + gt
vf = 30 + (-9.8)(4.2)
vf = -11.16 m/s
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Power = Force*distance/time
Given
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