Chapter 5 Answer Key: Projectile Motion

5.1 Horizontally Launched Projectiles

1.  5.0 m/s

2.  3.0 s

3.  5.3 m (horizontal)  – 11 m (vertical)

4.  The balloon misses the sunbather

5.  1250 m (no air resistance)

6.  21 m/s horizontal & -20 m/s vertical

7.  (i)  17.5 s (ii)  2430 m (iii)  221 m/s

8.  (i)  – 4.9 m (ii)  – 19.6 m

9.  (i)  0.49 s (ii)  99 m horizontal, – 1.2 m vertical

     (iii)  Yes.  Time is unchanged, displacement is 74 m horizontal & – 1.2 m vertical.

10.  4.6 m/s

11.  106 m

5.2 Projectiles Launched at an Angle (these take more time to solve)

1.  (i)  68.8 m/s vertical, 98.3 m/s horizontal (ii)  241 m

     (iii)  14.0 s (iv) 1380 m

2.  4.1 m up from launch height