Question:
a small sphere of mass m=2kg moving with a velociy u=4i-7j m collides with a smooth wall & returns with a velocity v=-i+3j m/s . the magnitude of the impulse recieved by the ball is
Answer:
Impulse = Change in momentum = mv – mu = 2 ( - i + 3j) – 2 (4i -7j ) = -10i + 20j Ns
Magnitude = square root of (100 + 400) = sqrt (500)
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