Question

If Zack has a mass of 80 kg, what is his weight on Earth? (Use the standard value of gravitational acceleration on Earth, which is approximately 9.8 m/s².)

A) 800 N
B) 80 N
C) 720 N
D) 784 N

Answer 1

Zack's weight on Earth is calculated using the formula w = mg, where w is weight, m is mass, and g is the acceleration due to gravity. Using Zack's mass of 80 kg and the standard Earth gravitational acceleration of 9.8 m/s², his weight is calculated to be 784 N.

Step-by-step explanation:

When the standard value of gravitational acceleration on Earth is 9.8 m/s², the weight of an object can be calculated by multiplying that value by the mass of the object. The formula to calculate weight (w) is given as:

w = mg

For Zack, who has a mass of 80 kg, his weight on Earth can be calculated as follows:

w = (80 kg)(9.8 m/s²) = 784 N

Therefore, Zack's weight on Earth is 784 N, making the correct answer (D) 784 N.