Question

what is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (formula: $ke = \frac{1}{2}mv^2$)
○ 25 j
○ 5 j
○ 50 j
○ 100 j

Explanation:

Step1: Identify given values

Mass \( m = 0.5 \, \text{kg} \), velocity \( v = 10 \, \text{m/s} \), formula \( KE=\frac{1}{2}mv^2 \).

Step2: Substitute values into formula

Substitute \( m = 0.5 \) and \( v = 10 \) into \( KE=\frac{1}{2}mv^2 \):
\( KE=\frac{1}{2}\times0.5\times(10)^2 \)

Step3: Calculate step by step

First, calculate \( (10)^2 = 100 \). Then, \( \frac{1}{2}\times0.5 = 0.25 \). Finally, \( 0.25\times100 = 25 \).

Answer:

25 J