Question

HELP!

Answer 1

Answer:

  1) Option D

  2) Option D

  3) Option C

Explanation:

1) Kinetic energy $=\frac{1}{2} mv^2$

    m = 500 kg

    v = 10 m/s

   Kinetic energy $=\frac{1}{2} *500*10^2=25000 J$

   Option D is the correct answer.

2) Potential energy = mgh

   m = 25 kg

    g = 10 m/s²

    h = 42 m

     Potential energy = 25 * 10 * 42 = 10500 J

   Option D is the correct answer.

3) Thermal equilibrium means no heat flow from each other two systems, that is achieved when both systems have same temperature.

  Option C is the correct answer.