Ikimot

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M=1000g 1000g to kg=1000/1000=1kg h1=5m h2=25m g= 10m/s^2 Kinetic energy before impact K.E= 1/2mv^2 U=0 V= don't know So we use the equation of motion V^2=U^2+2gh V^2=0^2+2×10×5 V^2=100 V=√100=10m/s K.E=1/2×1×10×10=50j (ii) it's initial rebounds velocity...