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 sec
ux remains same
=ucos60=40×12=20
uy=usin60g(1)

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