12.19 Work and Power

$$PE = mgh$$ where PE is potential energy, m is mass in kg, g is acceleration due to gravity (9.8 m/s²), and h is height in meters.

196 Joules (calculated using $$PE = mgh$$ ).

$$P = \frac{W}{t}$$ where P is power in Watts, W is work in Joules, and t is time in seconds.

20 Watts (calculated using $$P = \frac{W}{t}$$ ).

Joule.

$$KE = \frac{1}{2}mv^2$$ where KE is kinetic energy, m is mass in kg, and v is velocity in m/s.

18 Joules (calculated using $$KE = \frac{1}{2}mv^2$$ ).

Work is done when energy is transferred or transformed.

$$W = Fd$$ where W is work in Joules, F is force in Newtons, and d is distance in meters.

50 Joules (calculated using $$W = Fd$$ ).