1 ) For a given angle of projection , if the time of flight of projection is doubled , then horizontal range will increase to ?

1 ) For a given angle of projection , if the time of flight of projection is doubled , then horizontal range will increase to : -

A ) 2 times ,                                               B ) 4 times ,

C ) 8 times ,                                               D ) None of these ,

Correct Answer : -   B ) 4 times ,

Solution : -

 

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2 ) If the acceleration due to gravity at the earth’s surface is 9.8 m / s and the mass of earth is 80 times that of moon and the radius of earth is 4 times that of moon , the value of G at the moon’s surface will be : -

A ) 0.96  m / s2 ,                                                 B ) 1.96  m / s2 ,

C ) 9.8  m / s2 ,                                                   D ) None of these ,

Correct Answer : -   B ) 1.96  m / s2 ,

Solution : -

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3 ) An inclined plane makes an angle of 30 degree with horizontal . A solid sphere rolling down this inclined plane from rest without slipping has linear acceleration equal to : -

Solution :-

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