QUESTION 1 A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. The external force is removed, and the block is projected with a velocity vi = 1.2 rn/s when it separates from the spring, as shown in the figure. The block descends a ramp and has a velocity v2 = 1.4 m/s at the bottom of the ramp. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.25. The block moves on to D, where it stops. By how many centimeters was the spring initially compressed? v1
Ifwg-tiong A
O 0.49 cm O 026 cm O 0.18 cm O 0.99 cm O 0.67 cm
V2
V3
VI
Smoot
Rough
QUESTION 2
1″-
A 0.46-kg block is held in place against the spring by a 30-N horizontal external force. The external force is removed, and the block is projected with a velocity vi = 1 2 rnis upon separation from the spring, as shown in the figure. The block descends a ramp and has a velocity v2= 1.5 mis at the bottom. The track is frictionless between points A and B. The block enters a rough section at point B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.38. The velocity of the block is u3 = 1.4 rn/s at point C. The block moves on to D, where it stops. What distance does the block travel between points B and D? V1
A
O 0.30 m 0 0.039 m O 026 m O 0.40 m O 0 60 m
V3
Smooth B Rough
E
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