Question

question 7 of 25
a dog of mass 18 kg runs at a speed of 4 m/s. what is the momentum of the
dog?
a. 18 kg·m/s
b. 36 kg·m/s
c. 72 kg·m/s
d. 4.5 kg·m/s

Explanation:

Step1: Recall momentum formula

The formula for momentum \( p \) is \( p = m \times v \), where \( m \) is mass and \( v \) is velocity (speed in this case).

Step2: Substitute values

Given \( m = 18 \, \text{kg} \) and \( v = 4 \, \text{m/s} \), substitute into the formula: \( p = 18 \times 4 \).

Step3: Calculate the product

\( 18 \times 4 = 72 \), so the momentum is \( 72 \, \text{kg·m/s} \).

Answer:

C. 72 kg·m/s