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The acceleration versus time graph for a...

The acceleration versus time graph for a particle moving along a straight line is shown in the figure. If the particle starts from rest at t = 0, then its speed at t = 30 sec will be :

A

`20m//sec`

B

`40m//sec`

C

`0m//sec`

D

`-40m//sec`

Text Solution

Verified by Experts

The correct Answer is:
B
The acceleration ……..
For a - t curve
speed = |velocity|
speed (at t = 30 sec) `= |10xx4-4xx20|`
`= |40-80| = |-40| = 40m//sec`.
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