Solve Momentum Question: 5kg Object, 15 kg m/s, 8 m/s in 15s

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SUMMARY

The discussion focuses on calculating the net force required to accelerate a 5 kg object with an initial momentum of 15 kg m/s to a final velocity of 8 m/s over a duration of 15 seconds. The correct formula to use is F = ΔP/ΔT, where ΔP is the change in momentum. The change in momentum is calculated as the final momentum (mass times final velocity) minus the initial momentum, leading to a net force of 1.7 N, which corresponds to option B.

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Homework Statement


1. A 5kg object has a momentum of 15 kg m/s. What is the net force required to accelerate the object to 8 m/s over 15 seconds?
A) .35N
B) 1.7N
C) 5.1 N
D) 11 N
E) 23 N


Homework Equations


F=deltaP/deltaT


The Attempt at a Solution


So I use that formula (which I am not sure is right). so wouldn't it be mv/t. So, (5)(8)/15 which is 2.67N which is not an answer choice.

I think I am using the wrong formula, but it's all I can think of! Please help.
 
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The acceleration is not v/t in this case. The object has initial velocity because its momentum is 15 kg m/s before it starts accelerating.
 

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