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`        A boy of mass 60 kg is standing over  a platform of mass 40 kg placed over a smooth horizontal surface. e throwsa stone of mass 1 kg with velocity v = 10 m/s at an angle of 45 ° w.r.t ground. Find the displacement of the platform (with boy) on the horizontal surface when the stone lands on the ground.`
7 years ago

147 Points
```										Dear Sanchit
total mass of body and plateform = 100kg
conservation of momentum in horizontal direction     100V + 1*10cos45 =0
V=-1/10√2 m/sec
time  of filght = 2*10 sin 45 /10
= √2
so in this time plateform will move  = V*t
= 1/10√2 * √2
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7 years ago
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