Acar travelling with 20 m/s , comes to halt after travelling 18 m .find the time taken by the car to stop.

The answer is 1.8 m/s.

Explanation:

Formula of speed is given below:

Speed, V = Distance / time

Given data:

Distance, d = 18 m

Initial veliocity = 20 m/s  

Final velocity = 0 m/s

Time taken, t = ?

Find average speed:

Average speed =( initial velocity + final velocity)/2

                        = (20 + 0)/ 2

                         = 20/2 = 10 m/s

Average speed  = distance / time

Time = distance / Average speed

Time, t = 18m / 10ms-1 = 1.8 m/s

The time taken by the car is 1.8 m/s

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