pls help

Asked by  | 1st Aug, 2009, 04:29: PM

Expert Answer:

 

v = velocity = dx/dt = 10t + 20

where dx/dt = differentiation of position function i.e. x(t) w r t time.

a = acceleration = dv/dt = 10 m/s2 (Note that it's constant and doesn't depend on time)

velocity at t = 2 s,

v = 10 x 2 + 20 = 40 m/s

Hence momentum, p = mv = (2 kg)(40 m/s) = 80 kg.m/s

Force = ma = (2 kg)(10 m/s2) = 20 N

Regards
Team
TopperLearning

Answered by  | 1st Aug, 2009, 11:05: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.