1. A truck starts from rest and accelerates at 3 m/s^2
for 5 s and then continues with constant velocity.
Calculate the distance covered in 15 s since it starts
from rest.
[Ans : 187.5 m]
Answers
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8
Answer:
187.5 m
Explanation:
Distance covered in first 5 s
S = ut + 0.5at²
= (0 × 5) + (0.5 × 3 × 5²)
= 75/2 m
= 37.5 m
Velocity at the end of 5 s
v = u + at
= 0 m/s + (3 m/s² × 5 s)
= 15 m/s
From now, truck is moving with a uniform velocity of 15 m/s
Distance covered in rest of the 10 s
D = Speed × Time
= 15 m/s × 10 s
= 150 m
Total distance covered = 37.5 m + 150 m
= 187.5 m
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