a bodyof mass 2kgisprojected from the ground with a velocity 20m/s at an angle 30 with the vertical. If t1 is the time in sec at which the body is projected and t2 is the time at which it reaches the ground, then change in momentum during the time t2-t1 is
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Since momentum=2musinx. Here m=2 u=20 sinx=sin60(as the given angle is with vertical and we have to find our answer with th horizontal). Put these values in eq. and u will get your ans.
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