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ataglance05

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## Homework Statement

a) A car weighing 1000 kg is accelerated at 3 m/sec^2. What is the force required to produce that acceleration?.

b) in problem a- the car is accelerated for 45 seconds. How fast in m/sec is it going at the end of 45 sec?

c) in problem b- after the initial 45 second acceleration period, the car coasts (no net forces) for 20 minutes. ca) How fast is it going at the end of 20 minutes? How far did it go in hat 20 mintues?

cb) How much work was done on the car in that 20 minutes?

cc)At the end of the 20 minute coast period, the car is decelerated to a stop. How much work was done to bring the car to a stop?

cd)If the car took 35 seconds to stop, what was the force on the car and how far did it travel in the meters before it stopped

## Homework Equations

a) F=ma

b) Vf(final velocity)= Vo(initial velocity) + a(acceleration)T(time)

c) F=ma or Vf=Vo+aT or S(distance)=VoT+ 1/2(a)(T^2) or W(work)=(F)D

(D is distance)

## The Attempt at a Solution

a) F=ma

F=1000kg(3 m/sec^2)

F=3000 N

b) Vf=Vo+aT

Vf=0+3 m/sec^2(45 sec)

Vf=135 m/sec

c)PLEASE HELP!