1. 74 m/s
2. 64 m/s
3. 84 m/s
4. 94 m/s
1. 300 ° C
2. 400 ° C
3. 100 ° C
4. 200 ° C
1. 1.5 m
2. 3 m
3. 6 m
4. 7.5 m
1. Magnetic force
2. Electrostatic force
3. Viscous force
4. Archimedes's uplift
1. e = 0.18
2. e = 0.02
3. e = 0.2
4. e = 0.15
1. 2 : 3 : 5
2. 5 : 3 : 2
3. 15 : 10 : 6
4. 3 : 5 : 2