An object a of mass 1 kg is projected vertically
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any one can solve it plss..An object A of mass 1kg is projected vertically upward with a speed of 20m/s. At the same moment another object B of mass 3kg, which is initially above the object A, is dropped from a height h=20m. The two point like objects collide and stick to each other. Find K.E of combined mass just after the collision???