Question

(PLEASE SHOW FULL WORKING OUT) Problems 11 through 14 deal with the following scenario.

The first mission to Mars has chose to celebrate their success with a golf ball driving tournament on a large flat plain. When the first ball is hit it is launched from the ground at an angle of 45° to horizontal with an initial velocity of 14.1 m/s. Use 3.71 m/s2 as the exact value for the local gravity on Mars. Neglect drag.

11. How long before the golf ball lands?

A) 2.7 s

B) 5.4 s

C) 3.8 s

D) 7.6 s

12. How far does the golf ball from travel in the horizontal direction before it strikes the surface?

A) 54 m

B) 107 m

C) 27 m

D) 38 m

13. At what angle with respect to horizontal does the golf ball strike the surface of Mars?

A) 30°

B) 0°

C) -30°

D) 45°

14. Assume the golf ball has a mass of 0.05 kg. What is the normal force exerted on the ball while its in flight?

A) 0.14 N

B) 0 N
C) 0.19 N

D) 0.49 N

Answer 1

1)

2)

3)

Since the ball is launched at an angle of 45⁰ hence it will land an an angle of 45⁰ to the horizontal..

4)

Normal force = Weight of golf ball

= 0.05 x 3.71 = 0.19 N