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1st question:

A force of 1 N acts on a mass of 1kg for a time of 1 s. (A)What is the acceleration of the mass? (B)What speed does the mass reach? (C)How far does the mass move?

Here is my answer but I think it is wrong:

(A) acceleration=1N/1kg = or 1 meter per second per second

(B) acceleration=change in velocity/time.....I am not sure if that is the right equation to use

(C) velocity=change in average position/elapsed time ?

Then the second question that baffled me was:

in terms of power, explain why roads going up mountains are full of switchbacks and hairpin turn?

Is it something to do with the rate at which energy changes from on form to another?

I am really confused! Please help.