Question

A cyclist accelerates at a rate of 8.0 m/s^2.How long will it take the cyclist to reach a speed of 18 m/s? (Initial Velocity=0 m/s)

Answer 1

Given

Initial velocity (u)=0m/s

Speed=18m/s

Acceleration=8m/s^2

To find:time

By using 2nd equation of motion

S=ut+1/2at^2

18=0×t+1/2×8×t^2

18=4×t^2

18/4=t^2

4.5=t^2

t=√4.5

t=2.1 seconds

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Answer 2

Answer:

andy7 Ace

speed = total distance / total time taken

8 km/hr = 21000/t (as distance is given in meter we have to change in kilometer so, 21m = 0.021km

t = 0.021/8

t = 0.02625 hrxplanation: