4. A force acts on a bicycle for 14s and changes its momentum from 18 kg m/s in the positive direction to 43 kg  m/s in the positive x-direction. What are the magnitude and direction of the force?

A) 57 N + x direction

B) 1.1 N + x direction

C) 1.8 N + x direction

D) 2.3 N + x direction

Need help on thisproblem, will like to know how to solve it. Thank You

Any help on this problem would be greatly appreciated.

Two constant forces act on an object of mass m = 5.60 kg objectmoving in the xy plane. Force 1 is 28.0 N at 35.0°, and force 2 is50.0 N at 150°. At time t = 0, the object is at the origin and hasvelocity (3.40i + 2.45j) m/s.


(a) express the two forces in unit vector notation.

(b) Find total force exerted on the object

Now consider the instant t = 3.00s

(c) find objects velocity


Again, I'd be very appreciative of any help on this problem.

Thanks!

Hello,

I was hoping someone would be able to help me do this problem? I'mhaving a lot a difficulty in solving it. Thank you.

http://www.flickr.com/photos/27406966@N08/5183195752/