Question

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

Explanation:

Step1: Write the formula for kinetic energy

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

Step2: Substitute the given values

Given \( m = 7\space kg \) and \( v=4\space m/s \). Substitute into the formula: \( KE=\frac{1}{2}\times7\times(4)^{2} \).
First, calculate \( (4)^{2}=16 \). Then \( \frac{1}{2}\times7\times16 \).
\( \frac{1}{2}\times16 = 8 \), and \( 8\times7=56 \).

Answer:

C. 56 J