CBSE - Force

A body of mass 5 kg undergoes a change in speed from 20 m/s to 0.20 m/s. The momentum- (1) increases by 99 kgm/s (2) decreases by 99 kgm/s (3) increases by 101 kgm/s (4) decreases by 101 kgm/s

Which is not the unit of Force - (1) Poundal (2) Dyne (3) Joule (4) Newton

A Diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 ms –1 . The accelerating force on the rocket is: (1) 20 dyne (2) 20 Newton (3) 20 kg wt. (4) sufficient data not given

If an object moves with a uniform velocity we can conclude that (1) there is no force acting on the body (2) no unbalanced force acts on it (3) an unbalanced force acts on the body (4) it has uniform acceleration