Question

A softball is thrown with 145 Joules of kinetic energy. If the ball is moving at 20.0 m/s, what is the mass of the ball in kg?

Answer 1

0.725 kg

Step-by-step explanation:

Step 1: Given data

• Kinetic energy of the softball (K): 145 J

• Speed of the softball (v): 20.0 m/s

• Mass of the softball (m): ?

Step 2: Calculate the mass of the softball

We will use the following expression.

K = 1/2 × m × v²

m = 2 K / v²

m = 2 × 145 J / (20.0 m/s)²

m = 0.725 kg

The mass of the softball is 0.725 kg.