Question

A driver parked his car on a steep hill and forgot to set the emergency brake. As a result, the car rolled down the hll and crashed into a parked truck. If the car was moving at 10 mph (4 5 m/s) when it hit the truck 7 0 seconds after it began to move, what was the car's average acceleration while it rolled down the hill? Define the positive x direction to be down the hil

Answer 1

Solution:

Positive x direction is down the hill,

acceleration = velocity / time

=> a = 4.5 / 7

=> a = 0.643 m/s^2 ( down the hill ) or positive x direction

thanks.