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Plz answer it .,....
It is urgent....
The best will be brainliest...
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Explanation:
u = 0
a = 4 m/s²
t = 30 sec
at = v - u
4*30 = v - 0
120 = v
120 m = v ( highest velocity)
retardation = - a
u = 120 m
v = 0
t = 60
a = ( v - u) / t
a = - 20 m / s² ( magnitude of retardation)
speed * time = distance
120 * 90 = 10600 m
Average speed = total distance / total time
= 10600/ 90
= 120 m/ s²