At what rate is the gravitational force on a 2.0-kg projectile ...

[cmoore54]

At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the velocity of the projectile is 4.0 m/s directed 30 above the horizontal?
 a. +39 W
  b. -78 W
  c. -39 W
  d. +78 W
  e. +25 W

Question 2

A 6.0-kg block slides along a horizontal surface. If k = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?
 a. -59 W
  b. -47 W
  c. -71 W
  d. -82 W
  e. +71 W

[dyrone]

Answer to Question 1

C

Answer to Question 2

B

[cmoore54]

TY

[dyrone]

You're welcome