PH-2372
Conservation of energy
Physics · Secondary 4 · Hard · Conservation of energy
A trolley of mass 10 kg moves down a slope from point A to point B. Its gravitational potential energy decreases by 120 J and 40 J of work is done against friction. If its speed at A is 1.0 m/s, what is its speed at B?
- 3.0 m/s
- 3.7 m/s
- 4.1 m/s
- 5.0 m/s
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