Question

if a 7 kg bowling ball is traveling down the lane at 4 m/s, then what is its kinetic energy?
a 56 j
b 28 j
c 4 j
d 7 j

Explanation:

Step1: Recall Kinetic Energy Formula

The formula for kinetic energy (KE) is \( KE = \frac{1}{2}mv^2 \), where \( m \) is mass (in kg) and \( v \) is velocity (in m/s).

Step2: Substitute Values

Given \( m = 7 \, \text{kg} \) and \( v = 4 \, \text{m/s} \), substitute into the formula:
\( KE = \frac{1}{2} \times 7 \times (4)^2 \)
First, calculate \( (4)^2 = 16 \).
Then, \( \frac{1}{2} \times 7 \times 16 = 7 \times 8 = 56 \, \text{J} \).

Answer:

a. 56 J