200 meters in 5 seconds
average speed = 200/5 = 40 m/s
so speed is 80 m/s at 200 m
it slows down after that so 80 is your answer
goes at 80 for 300 m
time = 300/80 = 30/8 = 15/4 seconds between 200 and 500
now from 500 m and 80 m/s, brakes down to zero at -2 m/s^2
0 = 80 - 2 t
t = 40 seconds
so time total = 5 + 15/4 + 40
average speed during braking phase = 40
so from 500 m to stop it covers
40 * 40 =1600 meters
500 + 1600 = 2100 meters total
A vehicle starts from rest and accelerates with a constant acceleration, covering 200m in 5s. it then continues at a constant velocity for 300m before decelerating with a constant 2m/s^2 deceleration to a stop. what is the maximum speed attained, total time traveled, total distance covered?
1 answer
1 answer