a bus starts from rest and in 30s it reaches speed of 20m/s.then the speed remains steady for 15s and decreases steadily until it stops 5s later.what the distance covered from strat to finish.

Answer 1

acceleration
... d = 30 s * [(20 m/s + 0 m/s) / 2]

cruise
... d = 15 s * 20 m/s

deceleration
... d = 5 s * [(20 m/s + 0 m/s) / 2]

add the three distances