What is the magnitude of the average force required to stop an 1200 kg car in 9.0 s if the car is traveling at 80 km/h ? Express your answer using two significant figures.

Question

asked Jan 7, 2020 91.1k views

1 Answer

Jbgarr · Answer 1 · 2020-01-13T17:31:57+0000

Answer: 2960N

Step-by-step explanation:

According to newtons first law of motion, force = mass × acceleration

To get acceleration,

Acceleration = velocity/time

Velocity = 80km/hr

Converting the velocity to m/s

80×1000/1×3600

velocity = 22.2m/s

Time = 9secs

Acceleration=22.2/9

Acceleration = 2.47m/s²

The get the force

F= 1200×2.47

F = 2960N