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) 0.4 m/s² B) 1.3 m/s² C) 2.5 m/s² D) 4.9 m/s² E) 9.8 m/s²

Question

Quizplus · Accepted Answer

We can use the equation: 
distance = (initial velocity × time) + (1/2 × acceleration × time^2)
Since the car is initially at rest, the initial velocity is 0. 
Plugging in the values given: 
20 = 0 + (1/2 × acceleration × 4^2)
20 = 8 × acceleration 
acceleration = 2.5 m/s^2

Therefore, the correct answer is C.

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