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1. Find the acceleration of an object that moves from rest (vᵢ = 0) to 50 m/s in 5s.
2. A truck traveling at 50 km/h slows down to 30 km/h in 0.2 h. Find its acceleration.
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1. Find the acceleration of an object that moves from rest (vᵢ = 0) to 50 m/s in 5s.
2. A truck traveling at 50 km/h slows down to 30 km/h in 0.2 h. Find its acceleration.
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Explanation:
1. Starting from rest, a car is at 0 m/s. Then:
v=u+at
v-u/t=a
50/5=10 m/s² is the acceleration
Distance covered:
v²=u²+2ad
v²-u²/2a=d
d=50²/20
=125m
2. -100 m/s²