A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration.The acceleration of the car is: A)1.3 m/s² B)2.5 m/s² C)4.9 m/s² D)9.8 m/s² E)There is not enough information to answer this question.

Question

Quizplus · Accepted Answer

The acceleration can be found using the formula $s = ut + \frac{1}{2}at^2$, where $s$ is the distance traveled, $u$ is the initial velocity (0 m/s in this case), $a$ is the acceleration, and $t$ is the time. Plugging in the given values, $20 = 0*4 + \frac{1}{2}a*4^2$, solving for $a$ gives $a = 2.5 \, m/s^2$.

A Car, Initially at Rest, Travels 20 M in 4