Andrea rides her bicycle at a speed of 10 m/s. She and the bike have a combined mass of 50 kg.
a.
If she uses her brakes to slow down to 5 m/s, how much energy is converted to
heat?

1875 J of energy is converted to heat.

Explanation:

Given that,

The combined mass of Andrea and the bike is 50 kg

Initial speed of Andrea's bicycle, u = 10 m/s

Final speed of Andrea's bicycle, v = 5 m/s

The energy converted to heat can be calculated using the work-energy theorem as follows :

So, 1875 J of energy is converted to heat.

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

unlike poles attract