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physicszman

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Just wondered if any of you guys could help me out with these problems. Anything is appreaciated.

1)Can a rapidly moving object have the same acceleration as a slowly moving one? Why?

2) When you throw a ball straight up in the air, ignroing air resistance, what acceleration is it undergoing at the beginning? At the top of its motion? ( I think It is undergoing 9.8m/s2 in the begining and at the end its not undergoing anything?)

3) Three Forces, each 10N, act on the same object. What is the maximum total force they exert on te object? The minimum total force?

(I think 30N total, and 10N minimum)

4) If you drop your wallet from the top of a building, how long would it take to reach the ground.? Ignoring air resistance. The height of the building is 450m. ( I was thinking of finding the average velocity and then just 450m divided by it, the meters cancel out and u get the seconds?)

5) A bullet traveling at 500 m/s hits a tree and penetrates 0.170m before coming to a rest. Assuming constant decceleration, what is its average acceleration? How long does it take to stop? (NO IDEA!!)

Please list info on how to solve with solution. I am trying to understand this stuff. Exam is Friday!! Need halp badly. Thanks