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??