A dynamics cart has a kinetic energy of 4.2J when moving across a floor at 5.0 m/s. What is the mass of the cart?

Answer 1

The kinetic energy (KE) of an object can be calculated using the formula:

KE = 1/2mv^2

Where m is the mass of the object and v is its velocity.

Given that the kinetic energy of the cart is 4.2 J and its velocity is 5.0 m/s, we can rearrange the formula to solve for the mass (m):

m = 2KE / v^2

Substituting the given values:

m = 2 * 4.2 J / (5.0 m/s)^2

m = 2 * 4.2 J / 25 m^2/s^2

m = 0.336 kg

Therefore, the mass of the cart is 0.336 kg.