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5/36 MCQs for:

Kinematics in Two Dimensions: Vectors, projectiles

A boat, whose speed in still water is 8.0 m/s, is directed across a river with a current of 6.0 m/s. What is the speed of the boat as it crosses the river?

8.0 m/s.

6.0 m/s.

5.3 m/s.

10.0 m/s.

A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 200 above the horizontal. How far does the jumper jump?

15 m.

3.4 m.

6.2 m.

9.4 m.

At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?

00.

300

450.

600.

A ball is thrown at an original speed of 8.0 m/s at an angle of 350 above the horizontal. What is the speed of the ball when it returns to the same horizontal level?

4.0 m/s

16 m/s.

9.8 m/s.

8.0 m/s.

A plane has an air speed of 200 m/s due North, and is in a wind of 50.0 m/s to the West. The plane's speed relative to the ground is:

150 m/s.

200 m/s.

206 m/s.

250 m/s.