Question

A car is moving at a rate of 72km/hr. How does the car move when stop after 4 seconds.
Please answer step by step

Answer 1

Answer:

Hi friends

Explanation:

to convert speed in km/hr to m/s multiply 5/18

speed in m/s=72*5/18=20m/s

time=4s

distance =speed*time=20*4=80m

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Answer 2

Answer:

      s = 40m

Explanation:

initial speed = u = 72km/hr × 5/18 = 20m/s

Final speed = v = 0 (because the car stops

time = t = 4s

v = u + at

0 = 20 + 4a

4a = -20

a = 20 / -4

a = -5ms⁻²

s = ut + at² / 2

s = (20×4) + (-5×4×4 / 2)

s = (20×4) + (-5×4×2)

s = 80 + (-5×8)

s = 80 - 40

s = 40m

distance travelled = 40m