1.

. An object of mass 10 kg is projected from groundwith speed 40 m/s at an angle 600 with horizontalThe rate of change of momentum of object onesecond after projection in SI unit is[Take g 9.8 m/s2](1) 73(3) 176(2) 98(4) 140

Answer»

98 is the correct answer

Rate of change of momentum = force = weight of the object = 98 Newtons.There is only one force acting that is gravity.

We can find also this way:v = v cos60i + (v sin60 – g t) j

p = mv = mvcos60 i + m (v sin60 – gt) j

dp/dt = F =m a = m g j

= -10 * 9.8 j N

= 98j Newtons vertically downwards.



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