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Mahesh moving on a road with a uniform acceleration covers 20 m/s in one second and 40 m in 2 second . what is the acceleration?

Posted by Abhijeet Sharma 1 year, 8 months ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 1 year, 8 months ago

distance travelled in 1st second=20m

time taken to travel this distance=1s

So speed in first second is dist/time = 20m/s

Similarly speed in 2nd second is 40m/s

Now acceleration = dv/dt

Here dv means change in v, where v is velocity and dt means change in t where t is time interval.

Change in velocity = final vel. — initial vel.

That is, 40-20 = 20m/s

And change in time = 2 — 1 = 1s

So acceleration is 20m/s / 1s = 20m/s^2 Ans.

Metre per second square is the standard unit of acceleration.

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