Homework Help: physics

Posted by Nick on Wednesday, March 7, 2012 at 2:44am.

You throw a 134 g ball straight up to a height of 43.0 m.
(a) Assume that the displacement of your hand is 0.70 m as you throw the ball straight up. How long is the ball is in your hand?
(b) Calculate the average force exerted by your hand while you are throwing it.

physics - drwls, Wednesday, March 7, 2012 at 6:49am
(a) release velocity = sqrt(2gH) = 29.0 m/s
Time in hand = 0.70 m/(Avg. Velocity) = 0.70/(29.0/2) = 0.048 s

(b) Force * Distance = Work = Potential Energy Gain at max. height

F*0.70 = M*g*H = 0.134*9.8*43 J
Solve for F in Newtons

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