1 100 N
2. 3 KN
3. frictional coefficient & the normal force (the component perpendicular to the motion direction).
4. < 196 N
5. a) 489.1 N
b) 455.6 N
c) 1205.23 N, 1122.68 N
6. both stopped (v = 0.026 m/s » 0).
7. 0.28 m/s (in the same direction of skater B’s velocity).
8. 0.7
9. work: 2800 J; power: 2240 watt; potential energy: 2800 J
10. a) 28 Ns
b) 28 Ns
c) 56 N