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A particle of mass m is projected at an angle of 60o with a velocity of 20 m/s relative to the ground from a plank of same mass m which is placed on a smooth surface initially plank was at rest. The minimum length of the plank for which the ball will fall on the plank itself is (a) 40√3 (b) 20√3m (c) 10√3m (d) 60√3m

A particle of mass m is projected at an angle of 60o with a velocity of 20 m/s relative to the ground from a plank of same mass m which is placed on a smooth surface initially plank was at rest. The minimum length of the plank for which the ball will fall on the plank itself is
 
    (a)    40√3
    (b)    20√3m
    (c)    10√3m
    (d)    60√3m


Grade:upto college level

1 Answers

Simran Bhatia
348 Points
7 years ago

(a)  Since the mass is same therefore the length of the plank should be twice the range

 

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