Suppose a 170-g hockey puck is moving along a straight line on a frictionless surface with constant speed. How much force is exerted by the surface to the puck?  A.1.9 N B.1.7 N C.2.3 N D.2.1 N E.None of the Above

Consider the following situations:
(a) A car is moving along a straight road at a constant speed.
(b) A car is moving along a straight road while slowing down.
(c) A car is moving along a straight road while speeding up.
(d) A hockey puck slides along a horizontal icy (frictionless) surface.
(e) A hockey puck slides along a rough concrete surface.
(f) A cockroach is speeding up from rest.
(g) A rock is thrown horizontally; air resistance is negligible.
(h) A rock is thrown horizontally; air resistance is substantial.
(i) A rock is dropped vertically; air resistance is negligible.
(j) A rock is dropped vertically; air resistance is substantial.

Which of these situations describe the motion shown in the motion diagram at point A?

Consider the following situations: 

a. A car is moving along a straight road at a constant speed. 

b. A car is moving along a straight road while slowing down.

c. A car is moving along a straight road while speeding up.

d. A hockey puck slides along a smooth (i.e., frictionless) icy surface.

e. A hockey puck slides along a rough concrete surface.

f. A cockroach is speeding up from rest.

g. A rock is thrown horizontally; air resistance is negligible.

i. A rock is thrown horizontally; air resistance is substantial.

j. A rock is dropped vertically; air resistance is negligible.

k. A rock is dropped vertically; air resistance is substantial.

Which situation or situations describe the motion shown in the motion diagram at point C?

8.9. A 0.160 kg hockey puck is moving on an icy, frictionless, horizontal surface. At 1 = 0, the puck is moving to the right at 3,00 m/s. (a) Calculate the velocity of the puck (magnitude and direction) after a force of 25.0 N directed to the right has been ap- plied for 0,050 s. (b) II, instead, a force of 12.0 N directed to the left is applied from 1-0 to -0.050 s, what is the final velocity of the puck?