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Q.

An inclined plane of height 10 m and angle of inclination 30°with the horizontal is having a groove at an angle of 45° with the line of greatest slope. A particle is released from rest from the top of incline plane in the groove, the time taken by the particle to reach the bottom of the groove is (g = 10 m/ S2)

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a

 none of these 

b

1 sec

c

2 sec 

d

4 sec 

answer is B.

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