The initial velocity of a particle of mass 0.1kg is 40 m/s in the direction of the unit vector j. The velocity of the particle changed to 30 m/s in the direction of the unit vector i. Find the change in momentum.
Explanation
u = 40j m/s ; v = 30i m/s,
Change in momentum : (m(v – u))
= (0.1 (30i – 40j))
= (3i – 4j)
Magnitude : (sqrt{3^{2} + 4^{2}})
= (sqrt{25})
= (5 Ns^{-1})