I need help understanding the kinematic equations and when to use them?

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Science

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

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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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Anonymous
Really helpful material, saved me a great deal of time.

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