What is the minimum energy needed to lift a 1.0-kg rocket to a ...

[ARLKQ]

What is the minimum energy needed to lift a 1.0-kg rocket to a height of 200 km and to give it a speed of 8.0 km/s at that height? (Neglect air resistance and the small decrease in g over that distance.)
 
  A) 34 kJ B) 34 MJ C) 34 J D) 34 TJ E) 34 GJ

Question 2

A slanted roof rises at 35 above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it.
 
  A piece of ice at the top suddenly breaks loose and begins to slide down from rest. (a) How long will it take for the ice to reach the bottom edge of the roof? (b) How fast will the ice be traveling just as it reaches the bottom edge?

[daiying98]

Answer to Question 1

B

Answer to Question 2

(a) 1.3 s (b) 7.1 m/s

[ARLKQ]

Excellent

[marict]

Thanks for the timely response, appreciate it