# A stationary body explodes into four identical fragments such that three of them fly off mutually perpendicular to each other, each with same KE,  The energy of explosion will be a) b) c) d)

## Question ID - 100229 :- A stationary body explodes into four identical fragments such that three of them fly off mutually perpendicular to each other, each with same KE,  The energy of explosion will be a) b) c) d)

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Answer Key : (a) -
 (a) Let the three mutually perpendicular directions be along  and -axis, respectively. Where  and By linear momentum conservation, or or Total energy

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 A ball falls under gravity from a height of 10 m with an initial downward velocity  It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity  and (ii) the height to which the ball would rise after collision if the initial velocity was directed upwards instead of downwards? a) b) c) d)

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