Question

A car traveling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop. how much time will it take for the car to stop if it decelerates at -4.0 m/s2?

Answer 1

v₀ = initial speed of the car = 30 m/s

v = final speed of the car when it comes to complete stop = 0 m/s

a = acceleration of the car during the motion = - 4 m/s²

t = time taken by the car to stop

Using the equation

v = v₀ + a t

inserting the values in the above equation

0 = 30 + (- 4) t

0 = 30 - 4 t

4 t = 30

dividing both side "4"

4t/4 = 30/4

t = 30/4

t = 7.5 sec

Answer 2

Answer:

3 s

Explanation:

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