# Physics

A worker pushes a crate horizontally across a warehouse floor with a force of 245 N at an angle of 55 degrees below the horizontal. How much of the workerâ€™s force is not used to move the crate?
200.69 n
419.95 n(my choice/guess)
357.71 n
191.32 n

You stand in top a building 44 m talk with a water ballon. You drop the water ballon from rest. How fast is the balloon moving when it is halfway down the building?
20.78 m/s
39.81 m/s(my choice/guess)
19.68 m/s
26.92 m/s

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3. 👁 310
1. He only pushed with 245 !!, no way bigger component
245 - 245 cos 55 = 245 (1 - cos 55)

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2. falls 22 m from stop at 9.81 m/s^2
22 = (1/2)(9.81) t^2
so
t^2 = 4.48
t = 2.12 seconds
v = 9.81 t = 20.78 m/s

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3. or for first one, what is force down (not used)
245 * sin 55 = 200.69

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4. 2. V^2 = Vo^2 + 2g*d = 0 + 19.6*22 = 431.2.
V = 20.8 m/s.

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