Question

the table shows the masses of four objects. which object has a weight of about 22.5 n?

object	mass (kg)
rock	2.3
box	4.5
fish	5.8

• the book
• the rock
• the box
• the fish

Explanation:

Step1: Recall weight formula

Weight $W = m \times g$, where $g \approx 9.8 \, \text{m/s}^2$ (we can use $g \approx 10 \, \text{m/s}^2$ for approximate calculation, or use exact 9.8)

Step2: Calculate mass for target weight

Rearrange formula: $m = \frac{W}{g}$
Substitute $W = 22.5 \, \text{N}$, $g \approx 9.8 \, \text{m/s}^2$
$m = \frac{22.5}{9.8} \approx 2.30 \, \text{kg}$

Step3: Match to table values

Compare calculated mass to table entries.

Answer:

B. the rock