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A ball of mass 0.2kg strikes an obstacle...

A ball of mass 0.2kg strikes an obstacle and moves at `60^(@)` to its original direction. If its speed also changes from `20m//s" to "10m//s`, the magnitude of the impulse received by the ball is

A

`2sqrt7Ns`

B

`2sqrt3Ns`

C

`2sqrt5Ns`

D

`3sqrt2Ns`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaP_(x)=m(v_(x)-u_(x)), DeltaP_(y)=mv_(y)`,
`J=DeltaP=sqrt(Deltap_(x)^(2)+Deltap_(y)^(2))`
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Knowledge Check

  • A cricket ball of mass 160g is moving horizontally directly towards a batsman. Its speed just before it hits the bat is 30m//s . It leaves the bat at 40 m//s at 90^(@) to its original direction. Find the magnitude of the impulse (in N - s) imparted to the ball.

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  • A cricket ball of mass 0.5 kg strikes a circket bat normally with a velocity of 20" m s"^(-1) and rebounds with a velocity of 10" m s"^(-1) . The impulse of the force exerted by the ball on the bat is

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    15 N s
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  • A batsman hits back a ball of mass 0.2 kg, straight in the direction of the bowler without chaning its initial speed of 6 m/s. What is the impulse impated to the ball?

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