For this problem, assume that the acceleration of gravity is 10 ...

[AEWBW]

For this problem, assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?
 
  A) zero
  B) 10 m/s upward
  C) 10 m/s downward
  D) 20 m/s downward
  E) 20 m/s upward

Question 2

A toy rocket, weighing 10. N, blasts off from ground level. At the exact top of its trajectory, its energy is 140. J. To what vertical height does it rise?
 
  A) 1.4 m
  B) 14. m
  C) 12. m
  D) 0.12 km
  E) 1.4 km

[carlsona147]

Answer to Question 1

C

Answer to Question 2

B

[AEWBW]

Gracias!

[essyface1]

Excellent