Author Question: A 2.0-kg body moving along the x axis has a velocity vx = 5.0 m/s at x = 0. The only force acting on ... (Read 120 times)

cherise1989 · **on:** Jul 28, 2018

A 2.0-kg body moving along the x axis has a velocity v_x = 5.0 m/s at x = 0. The only force acting on the object is given by F_x = (4.0x) N, where x is in m. For what value of x will this object first come (momentarily) to rest?

a.
4.2 m

b.
3.5 m

c.
5.3 m

d.
6.4 m

e.
5.0 m

Question 2

A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37 above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?

a.
34 J

b.
64 J

c.
30 J

d.
94 J

e.
+64 J