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A particle P moving with speed v undergoes a head -on elastic collision with another particle Q of identical mass but at rest. After the collision

(a)  Both P and Q move forward with speed  v/2

(b)  Both P and Q move forward with speed  v/√2

(c)   P comes to rest and Q moves forward with speed v  

(d)  P and Q move in opposite directions with speed   v√2

Answer : c

(6)

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