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Question

A particle having a mass 0.5 kg is projected under gravity with a speed of 98 m/sec at an angle of 60 the magnitude of the change of momentum of the particle after 10 seconds angle of 60 the magnitude of the change momentum of the particle after 10 sec is.

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Solution

m = mass of the particle = 0.5 kg

v = initial velocity of the particle = (98 Cos60) i + (98 Sin60) j = 49 i + 84.87 j

a = acceleration = 0 i - 9.8 j

v = final velocity = ?

t = time of travel = 10 sec

final velocity using the kinematics equation is given as

v = v + at

v = (49 i + 84.87 j ) + (0 i - 9.8 j ) (10)

v = 49 i -13.13 j

change in momentum is given as

ΔP = m (v - v)

ΔP = (0.5) ((49 i -13.13 j) - (49 i + 84.87 j))

ΔP = (0.5) (- 98) j

ΔP = - 49 j

magnitude of change in momentum : = 49


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