Question

A car is coasting backward down a hill at -3.0 m/s when the driver gets the engine started. After 2.5 seconds, the car is moving uphill at a velocity of +4.5 m/s. What is the car’s average acceleration?

Answer 1

The average acceleration of the car is 3.0 m/s².

Step-by-step explanation:

The average acceleration of the car can be calculated using the formula:

acceleration = (final velocity - initial velocity) / time

In this case, the final velocity of the car is +4.5 m/s, the initial velocity is -3.0 m/s, and the time is 2.5 seconds. Plugging these values into the formula:

acceleration = (4.5 m/s - (-3.0 m/s)) / 2.5 s

acceleration = 7.5 m/s / 2.5 s

acceleration = 3.0 m/s²

Therefore, the average acceleration of the car is 3.0 m/s².