Answer to Question #350192 in Physics for twice

Question #350192

A car that weighs 7,000 N is accelerated from rest to a velocity of 25 m/s eastward by a force of 1,000 N. (a) What was the change in momentum of the car? (b) How long did the torce a to change the momentum of the car?



1
Expert's answer
2022-06-13T08:23:02-0400

Given:

mg=7000Nmg=7000\:\rm N

F=1000NF=1000\:\rm N

Δv=25m/s\Delta v=25\:\rm m/s


(a)

Δp=mΔv=7000/9.825=17500kgm/s\Delta p=m\Delta v\\ =7000/9.8*25=17500\:\rm kg\cdot m/s

(b)

F=ΔvΔtF=\frac{\Delta v}{\Delta t}

Δt=ΔvF=175001000=17.5s\Delta t=\frac{\Delta v}{F}=\frac{17500}{1000}=17.5\:\rm s


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