physics hw help

Question

A 3kg object moving at 4 m/s encounters a 20 N resistive force over a duration of 0.20 seconds. The impulse experienced by this object is _____

a)Intial momentum - final mometum

b)5 N . s

c)4 N/s

d)24 N .s

e)12 N.s

Answer 1

A 3kg object moving at 4 m/s encounters a 20 N resistive force over a duration of 0.20 seconds. The impulse experienced by this object is _____

a)Intial momentum - final mometum

b)5 N . s

c)4 N/s

d)24 N .s

e)12 N.s

Initial momentum = Mass* Velocity 3 *4 = 12 kgm/s

Impulse = force *Time =10*0.2 = 2 Ns = Change in momentum

Momentum after = 12- 2 = 10 kgm/s

Impulse = 2 kgm/s