Question

What is the kinetic Energy of an 85 lb. (38.56 kg) child that has jumped off a platform 15 meters high and is falling with a velocity of 10 m/s due to gravity (9.8 m/s?)

A) 5,668.2 J
B) J 4,250 J
C) 1,928 J
D) 12,495 J​

Answer 1

The kinetic energy of an 85 lb. child falling with a velocity of 10 m/s is calculated using the formula KE = 0.5 × mass × velocity squared, resulting in 1928 joules (Option C).

Step-by-step explanation:

The kinetic energy (KE) of an object can be calculated using the formula KE = 0.5 × mass × velocity2. For an 85 lb. (38.56 kg) child falling with a velocity of 10 m/s, the kinetic energy can be determined by plugging these values into the equation:

KE = 0.5 × 38.56 kg × (10 m/s)2 = 0.5 × 38.56 × 100 = 1928 joules.

Therefore, the kinetic energy of the child is 1928 joules (Option C).