Q=A ball of mass 20 g hits a wall at an angle of 45o with a velocity of 15 m/s.If the ball rebound at 90o to the direction of incidence ,calculate the impulse received by the ball.

Let the ball hit the wall making an angle of 45 with the wall.

After hitting the wall, the ball makes an angle of 90 with the incident direction as shown in the figure. 

Initial velocity be u

=> final velocity = -u

On resolving the inital and final veocity,

the cos components cancel each other whereas the sine components add up,

change in momentum,Δp = 2musin(45o)

 = 0.42kgm/s

  • 35

first tell whether 45 angle is with vertical or horizontal

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