When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s². In the next 5 s the car travels A) 15 m. B) 32 m. C) 35 m. D) 47 m.

Question

Quizplus · Accepted Answer

The initial velocity (u) of the car is 10 m/s and the acceleration (a) due to braking is -1.2 m/s^2 (negative because it is in the opposite direction to the motion of the car). Using the equation of motion, s = ut + 0.5at^2, where s is the distance traveled, t is time, we can find the distance traveled by the car in the next 5 s:

s = 10×5 + 0.5×(-1.2)×(5^2) = 50 - 15 = 35 m

Therefore, the best choice is C, 35m.

When Its Brakes Are Applied, a Car Moving at 10