Which falling object has the least kinetic energy when it collides on the ground? a b 120 Kg of water falling at 12m / s 120 Kg of sand falling 12m / s 12 Kg of water falling at 10m / s 12 Kg of sand falling at 8m / s

Answer 1

The kinetic energy of an object is given by the formula KE = 0.5 * m * v^2, where m is the mass of the object and v is its velocity.

Let's calculate the kinetic energy for each falling object:

1. 120 Kg of water falling at 12m/s:
KE = 0.5 * 120 * 12^2 = 8640 J

2. 120 Kg of sand falling at 12m/s:
KE = 0.5 * 120 * 12^2 = 8640 J

3. 12 Kg of water falling at 10m/s:
KE = 0.5 * 12 * 10^2 = 600 J

4. 12 Kg of sand falling at 8m/s:
KE = 0.5 * 12 * 8^2 = 384 J

The object with the least kinetic energy when it collides on the ground is 12 Kg of sand falling at 8m/s, with a kinetic energy of 384 J.