Description
What is the acceleration of a vehicle that changes its velocity from 200 km/h to a dead stop in 30 s ? Answer in units of m/s 2
Explanation & Answer
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acceleration = change of velocity ÷time
= (final velocity - inital velocity) ÷ time
We have to change the velocity to m/s first before uding this formula
200 km = 200 × 1000n = 20000m
and 1 hour = 60 × 60 s = 3600 s
So initial velocity = 20000 ÷ 3600 = 50/9 = 5.5556m/s
So accelation = ( 0 - 5.55556 ) ÷ 30
= -0.185185 m/s^2
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