Answer:
The answer is 1.8 m/s.
Step-by-step 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