Question

a student has a mass of 68 kg and is wearing a backpack that has a mass of 10 kg. what would be the total weight of the student and the backpack on earth? a. 764 n b. 78 kg c. 78 n d. 764 kg

Explanation:

Step1: Calculate total mass

First, find the total mass of the student and the backpack. The student's mass is \( 68 \, \text{kg} \) and the backpack's mass is \( 10 \, \text{kg} \). So total mass \( m = 68 + 10 = 78 \, \text{kg} \).

Step2: Use weight formula

Weight \( W \) is calculated by \( W = mg \), where \( g = 9.8 \, \text{m/s}^2 \) (acceleration due to gravity on Earth). Substitute \( m = 78 \, \text{kg} \) and \( g = 9.8 \, \text{m/s}^2 \) into the formula: \( W = 78 \times 9.8 = 764.4 \, \text{N} \approx 764 \, \text{N} \).

Answer:

A. 764 N