Question

# An object of mass 10 kg is projected from ground with speed 40 m/s at an angle 60o with horizontal. The rate of change of momentum of object one second after projection in SI unit is [Take g=9.8m/s2]

A
73
B
98
C
176
D
140
Solution
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#### After 1 secux remains same=ucos60∘=40×12=20u′y=usin60∘−g(1)

2
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