## You are driving to the grocery store at 14 m/s. You are 115 m from an intersection when the traffic light turns red. Assume that your reacti

Question

You are driving to the grocery store at 14 m/s. You are 115 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. How far are you from the intersection (in m) when you begin to apply the brakes

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Physics
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2021-07-21T22:28:08+00:00
2021-07-21T22:28:08+00:00 1 Answers
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## Answers ( )

Answer:

111.5 m

Explanation:

Given that You are driving to the grocery store at 14 m/s. You are 115 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration.

Use first equation of motion

V = U – at

Since the car is going to rest, V = 0 and a = negative

0 = 14 – a × 0.5

0.5a = 14

a = 14 /0.5

a = 28 m/s^2

Let us use second equation of motion

S = Ut – 1/2at^2

S = 14 × 0.5 – 0.5 × 28 × 0.5^2

S = 7 – 3.5

S = 3.5 m

115 – 3.5 = 111.5

Therefore, you are 111.5 metres from the intersection (in m) when you begin to apply the brakes.