Question

(c) The driver of a car traveling at a speed of 17 m/s slams on the brakes and comes to a stop in 3 s. If we assume that the speed changed at a constant rate (constant net force), what was the average speed during this 3 s interval?

Answer 1

Answer:

$v_{avg}=8.5\ m/s$

Explanation:

given,

initial speed of the car, v₁ = 17 m/s

final speed of the car, v₂ = 0 m/s

car stops in time = 3 s

we need to calculate average speed

$v_{avg}=\dfrac{v_1 + v_2}{2}$

$v_{avg}=\dfrac{17 + 0}{2}$

$v_{avg}=\dfrac{17}{2}$

$v_{avg}=8.5\ m/s$

average speed of the car during interval of 3 s is 8.5 m/s