Question

.A child has a mass of 35g and is running across a field with a speed of 3m/s. What is the kinetic energy of this child?

A) 52.5 J
B) 15.75 J
C) 45 J
D) 36.75 J

Answer 1

The kinetic energy of the child is approximately 0.1575 J.

Step-by-step explanation:

The kinetic energy of an object is given by the formula KE = 0.5 * mass * velocity^2. In this case, the child has a mass of 35g, which is equal to 0.035 kg, and is running with a speed of 3 m/s. Plugging these values into the formula, we get:

KE = 0.5 * 0.035 kg * (3 m/s)^2 = 0.5 * 0.035 kg * 9 m^2/s^2 = 0.1575 J

Therefore, the kinetic energy of the child is approximately 0.1575 J. This corresponds to answer choice B) 15.75 J.