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Two putty balls of equal mass moving with equal velocity in mutually perpendicular directions, stick together after collision. If the balls were initially moving with a velocity of 452 ms−1 each, the velocity of their combined mass after collision is

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answer is 45.

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Detailed Solution

Initial momentum P→=m452 i^+m452 j^ ⇒|P→|=m×90Final momentum 2m×VBy conservation of momentum 2m×V=m×90∴V=45 m/s

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