A boy throws a ball with an initial velocity of 25 m/s at an ...

[sheilaspns]

A boy throws a ball with an initial velocity of 25 m/s at an angle of 30 above the horizontal. If air resistance is negligible, how high above the projection point is the ball after 2.0 s?
 
  A) 25 m B) 43 m C) 13 m D) 50 m E) 5.4 m

Question 2

A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
 
  A) 0.678 m/s
  B) 0.106 m/s
  C) 1.36 m/s
  D) 1.14 m/s
  E) 2.72 m/s

[Li Jun]

Answer to Question 1

E

Answer to Question 2

C