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Q.

A stone is projected  from the ground with velocity 50 m/s at an angle of 300 with the horizontal. It crosses a wall after 3 sec. How far beyond the wall the stone will strike the ground. (g=10m/s2)

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a

 90.2 m 

b

 89.6 m 

c

  86.6 m  

d

70.2 m

answer is C.

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Detailed Solution

its total time of flight T =2 u sinθg= 5 sec in remaining 2 sec horizontal distance travelled u cosθ x2

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