(adsbygoogle = window.adsbygoogle || []).push({}); Physics 11 question -- its probs rly easy !!

1. The problem statement, all variables and given/known data

A horizontal force applied to a 7.0 kg object initially at rest causes it to accelerate uniformly and travel a distance of 21m in 4.2s. What is the change in momentum of the object?

2. Relevant equations

p = mv

3. The attempt at a solution

Heres what i did but got it wrong:

p=mv

=(7.0kg)(0 m/s)

= 0

p=mv

=(7.0kg)(5m/s)

= 35

so the answer should be 35 ya?

but the answer in the back of the book is 70 kg x m/s

help??

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# Homework Help: Physics 11 question - its probs rly easy

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