Acar accelerates from rest to a velocity of 5 meters/second in 4 seconds. what is its average acceleration over this period of time? its acceleration is 1.25 meters/second. its acceleration is 5 meters/second. its acceleration is 0.8 meters/second. its acceleration is 1.25 meters/second2. its acceleration is 20 meters.

Its acceleration is 1.25 meters/second2 ( )

Explanation:

Acceleration is defined as the rate of change of velocity per unit time:

where

v is the final velocity

u is the initial velocity

t is the time taken

In this problem, the initial velocity of the car is zero: u=0. The final velocity is v=5 m/s, and the time taken is t=4 s, so the acceleration is

we need to know the time interval during which the force acts. impulse of force = momentum change