InterviewSolution
Saved Bookmarks
| 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. |
|