Question

A 1000 kg Civic is travelling at 30 m/s and accelerates to 40 m/s in 10 seconds.
a. What is the change in momentum?
b. What is the impulse?
c. What is the net force that causes the change?

Answer 1

a. $\Delta p=mv_2-mv_1=m(v_2-v_1)=1000\cdot(40-30)=10000(kg\cdot m/s)$

b. $I=F\Delta t=1000\cdot\frac{40-30}{10}\cdot10=10000(kg\cdot m/s)$

c. $F=ma=1000\cdot\frac{40-30}{10}=1000(N)$