19. a boy of 50 kg mass is running with a velocity of 2 m/s. He jumps over a stationary cart of 2 kg while running. Find the velocity of cart after jumping of boy. [v2=1.92 m/s]
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Given:
m1 = 50 kg
v1 = 5 m/s [E]
m2 = 20 kg
v2 = 1.5 m/s [E]
v3 = final velocity
Foemula:
m1v1 + m2v2 = (m1 + m2) x v3
We need to find v3
v3 = (m1v1 + m2v2) / (m1 + m2)
= (50x5 + 20x1.5) / (50 + 20)
= 280 / 70
= 4 m/s [E]
The final velocity is 4 m/s [E].
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