Question

find kinetic energy of a stone of 100 gm moving at a veloity of 20 cm/s.​

Answer 1

Answer:

K.E = 1/2 mv2

Explanation:

therefore the kinetic energy

of the ball is 20 joules

Answer 2

Answer:

The kinetic energy of a stone of 100 gm moving at a velocity of 20 cm/s is 0.002 J.

Explanation:

Kinetic energy is the energy that an item or particle has as a result of its movement. When work is done on an object by exerting a net force, the object accelerates and gains kinetic energy as a result. Kinetic energy is a property of a moving item or particle that is determined by its mass as well as its motion.

Given that:

Mass m = 100 g = $\frac{100}{1000}$ kg = 0.1 kg

Velocity v = 20 cm/s = $20*\frac{1}{100}$ m/s = 0.2 m/s

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

                        = $\frac{1}{2}$ × $0.1$ × $0.2^{2}$

                        = 0.002 J

Therefore the kinetic energy of a stone of 100 gm moving at a velocity of 20 cm/s is 0.002 J.