A box of a mass 2 kg is released from rest at the top of the ramp shown int the

Question

A box of a mass 2 kg is released from rest at the top of the ramp shown int the figure. The numbered circles indicate relevant situations for the problem:

(1) when the box is at the top of the ramp,

(2) when the box is at the bottom of the ramp(we assume a smooth transition from the ramp to the horizontal floor),

(3) at a distance s from the end of the ramp.

The friction coefficient of the ramp is 0.1, the friction coefficient of the level surface is 0.05, and we use g=10 m/s^2.

A) Which of the following principle(s) apply when the box slides down the ramp?

(i) W net= K2-K1

(ii) U1+K1= U2+K2

(iii)U1+K1= U2+K2-W fr.

1) Only (i)

2) Only(ii)

3) Only(iii)

4) (i) and (ii)

5) (i) and (iii)

B) Calculate the work done by the friction force as the box slides down the ramp. The work due to friction is

1) -23J

2) -20J

3) -12J

4) 20 J

5) 120J

C) The speed of the box in the situation(2), at the bottom of the ramp, is 10m/s. What is the kinetic energy of the box in state(2)?

1) 10 m/s

2) 10 J

3) 100 m^2/s^2

4) 100 J

5) 120 J

D) Calculate the speed of the box in situation(3), after the box has traveled a distance of 19 m on a level surface with a frictioncoefficient0.05

1) 0 m/s

2) 2 m/s

3) 4.5m/s

4) 9 m/s

5) 10m/s

Explanation / Answer

couldnt see the picture

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