Question

A scooter acquires a velocity of 36km/hr in 10 seconds just after the start.it takes 20 seconds to stop.calculate the acceleration in the two cases

Answer 1

1 cause Answer:Initial velocity =0m/s

Final velocity=36km\hr=10m\s

Time=20sec

A=v-u/t

A=10-0/10-0

A=1

a=1m\s

2cause v-u\t

0-10/20

1m\s

Explanation:

Answer 2

CASE 1 :

Initial Velocity : 0 km/h =0 m/s.

Final Velocity : 36 km/h = 36×5/18 = 180/18 =10m/s

Time : 10 seconds

Acceleration = Final Velocity -Initial Velocity /Time taken

a= 10-0 = 10/10 = 1 m/s²

10

CASE 2:

Initial Velocity : 36 km/h = 10m/s

Final Velocity : 0m/s

Time : 20 seconds

a=v-u/t = 0-10 = -10/20 = -1/2 = -0.5 m/s²

20

Retardation or de-acceleration = -0.5 m/s²

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