Question

A car 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.

Answer 1

The car's average acceleration would be 1.25m/s^2 or 1.25meters/second/second. That looks to be the fourth one you've listed.

Answer 2

Answer:

Its acceleration is 1.25 meters/second2 ($1.25 m/s^2$ )

Explanation:

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

$a=\frac{v-u}{t}$

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

$a=\frac{v-u}{t}=\frac{5 m/s-0}{4 s}=1.25 m/s^2$