anonymous 4 years ago 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

1. anonymous

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$P = F \cdot v$

2. anonymous

thanks eashmore that helps alot

3. anonymous

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

4. anonymous

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