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what is the rediation of car moving with a velocity of 50 km/hour brought to rest in 45 second?​

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A car moving with a velocity of 50 km/hr is brought to rest in 45 secs. Find out the retardation in m/sec

Physics

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Keertana Nanda

Grade 11

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We have to find the initial velocity.

Final velocity as the car stops after some time, (v) = 0 m/s

Acceleration for the entire journey, (a) = –2.5 m/s2

Time taken is (t) = 10 s

Let the initial velocity be (u)

We can calculate initial velocity using 1st equation of motion as, u = v – at

So initial velocity,

u = 0 – (–2.5)(10)

⇒ u = 25 m/s