Respuesta :
1,000 grams = 1 kilogram
20 grams = 0.02 kilogram
Kinetic energy = (1/2) (mass) x (speed)²
(1/2) (0.02) x (15)² =
(0.01) x (225) = 2.25 joules
Answer : The correct option is, 2.25 joules.
Explanation : Given,
Mass of the stone = 20 g
Velocity of the stone = 15 m/s
Formula used for kinetic energy is :
[tex]K.E=\frac{1}{2}mv^2[/tex]
where,
K.E = kinetic energy of the stone
m = mass of the stone
v = velocity of the stone
Now put all the given values in this formula, we get the kinetic energy of the stone.
[tex]K.E=\frac{1}{2}\times (20g)\times (15m/s)^2[/tex]
[tex]K.E=2250gm^2/s^2=2.25Kgm^2/s^2=2.25J[/tex]
Therefore, The kinetic energy of the stone is, 2.25 joules.
