An amount of work equal to 2.0 J is required to compress the ...

[pane00]

An amount of work equal to 2.0 J is required to compress the spring in a spring-gun. What is the launch speed of a 26.0-g marble?
 a. 12.4 m/s
  b. 13.4 m/s
  c. 8.8 m/s
  d. 3.92 m/s
  e. 0.392 m/s

Question 2

A 2.50-kg projectile is launched at an angle of 20.0 above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high. If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction?
 a. 3.3E+3 J
  b. 1.7E+2 J
  c. 3.5E+3 J
  d. 2.4E+4 J

[dmurph1496]

Answer to Question 1

a

Answer to Question 2

a

[pane00]

Thanks for the timely response, appreciate it

[Viet Thy]

Excellent