Question

A car is slowing down in a certain time t. They give you mass, initial velocity, velocity. Find the force that slowed it down. Find the power needed to keep the car at a consant velocity

Answer 1

The acceleration can be found from \[a = {\Delta v \over \Delta t}\]With the acceleration and mass, we can find the associated force from \[F = m \cdot a\]The power can be found from\[P = F \cdot v\]

Answer 2

thanks eashmore that helps alot

Answer 3

Would the force be negative tho for part a because it is slowing the car down or no?

Answer 4

Negative relative to the car's initial motion, yes.