The radius of the earth is R. At what distance above the earth's ...

[ereecah]

The radius of the earth is R. At what distance above the earth's surface will the acceleration of gravity be 4.9 m/s2?
 
  A) 0.41 R
  B) 0.50 R
  C) 1.00 R
  D) 1.41 R
  E) 0.25 R

Question 2

In a ballistics test, a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.
 
  (a) What is the magnitude of the average acceleration of the bullet in the sandbag? (b) How many milliseconds does it take the bullet to come to rest in the sandbag?

[recede]

Answer to Question 1

A

Answer to Question 2

(a) 1.25  106 m/s2 (b) 0.400 ms