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Question

A body projected from the bottom of a smooth inclined plane with a velocity 9.8 m/sec. The angle of inclination of the plane is 30o. If it comes to rest after reaching the top of the plane, then the time of ascent is

A
2 sec
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B
1 sec
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C
0.5 sec
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D
1.5 sec
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Solution

The correct option is A 2 sec
Retardation along the plane is a=g sin30o=0.5g=4.9m/s2
v=u+at, where v=0 and u=9.8
So, t=2 sec

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