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Subject :NSO    Class : Class 7

Which car, moving from rest, has an average acceleration of 2.0 m s–2?

A A car reaching a speed of 10 m s–1 in 2 s.
B A car reaching a speed of 20 m s–1 in 5 s.
C A car reaching a speed of 30 m s–1 in 10 s.
D A car reaching a speed of 40 m s–1 in 20 s.

what is full meaning of 2.0 m s–2 and give the answer of this question.

Ans 1:

Class : Class 7

Ans 2:

Class : Class 8
option D is correct as Average acceleration=Final velocity - Initial velocity/Change in time

Ans 3:

Class : Class 9
The correct answer is 'd'. M/s^2 or metre per second square. That is because the formula for acceleration is change in velocity /time. The SI unit of velocity is m/s (as it is displacement /time) and the SI unit of time is second. So the SI unit of acceleration is m/s/s which can also be written as m/s^2

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