Question

A 5kg object has a momentum of 15 kg ms-1 what is the net firce requierd to accelerate the object to 8 ms-1 over 15 seconds

Answer 1

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The force required will be 5/3 N

Explanation:

Given that

Mass of object = m = 5kg

Initial momentum = p = 15kg m/s

Time taken = t = 15s

We know that,

Momentum = mv

Final momentum = mv

                            = 5*8

                            = 40kg m/s

We also know that,

Force is the rate of change of momentum

F = change in momentum/time taken

Change in momenum = 40 - 15 = 25kg m/s

Time taken = 15s

Therefore,

F = 25/15

F = 5/3 N

Answer 2

Answer:

5\3 N

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