A 310-g air track cart is traveling at 1.25 m/s and a 260-g cart ...

[809779]

A 310-g air track cart is traveling at 1.25 m/s and a 260-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?
 
  A) 1.47 m/s B) 1.29 m/s C) 0.131 m/s D) 0.0732 m/s E) 2.80 m/s

Question 2

Kieran takes off from rest down a 50 m high, 10 slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the surface of the slope. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible).
 
  Kieran's speed at the bottom is 40 m/s. What is the coefficient of kinetic friction of his skis on snow?
  A) 0.23 B) 0.47 C) 0.58 D) 0.29

[aruss1303]

Answer to Question 1

D

Answer to Question 2

B

[809779]

Gracias!

[Jossy]

Excellent