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]

73

98

176

140

A

73

B

176

C

140

D

98

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Solution

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After 1 sec ux remains same =ucos60∘=40×12=20 u′y=usin60∘−g(1)

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