4. A physics student throws two bricks from the top of FawcettHall. Brick A is thrown straight up with an initial speed vo, andbrick B is thrown straight down with the same initial speed. If airresistance is negligible, when they strike the ground

      a) B has greaterspeed.      b) A has greateracceleration.      c) B has greateracceleration.

      d) A and B have samespeed.      e) A has greater speed.

5. A bullet shot straight up returns to its starting point in 10s. If it moved frictionlessly, its initial speed must have been_____ m/s.

      a)24.5       b)9.8        c)49         d)196        e) 98

6. A butterfly moves with a speed of v = 12.0 m/s. Thex-component of its velocity is 8.00 m/s. The angle between thedirection of its motion and the x-axis must be

      a)48.2°      b)41.8°      c)53.0°      d)33.7°      e) 30.0°

7. Two displacement vectors have magnitudes of 5 m and 7 m,respectively. When these two vectors are added, the magnitude ofthe sum is

      a) between 2 m and 12m.      b) larger than 12m.      c) 12m.      d) 2 m.

      e) smaller than 2.

8. A ball thrown horizontally from a point 24 m above theground, strikes the ground after traveling horizontally a distanceof 18 m. Its initial speed was _____ m/s.

      a)8.13       b)13.1       c)39.8       d)7.35       e) 12.5

9. You hit a tennis ball over the net. When the ball reaches itsmaximum height, its speed is

      a) greater than its initialspeed.      b) less than its initialspeed.

      c) equal to its initialspeed.      d) zero.