Question

a 0.25 kg phone falls from a ledge. at 0.6 s, the phone is 18.2 m above the ground. what is the potential energy of the phone?
$e_{p} = ?$ j
$e_{p} = mgh$
for gravitational acceleration, use $g = 10\\ m/s^{2}$.
4.55 j
0.50 j
45.5 j

Explanation:

Step1: Identify given values

Mass \( m = 0.25 \, \text{kg} \), gravitational acceleration \( g = 10 \, \text{m/s}^2 \), height \( h = 18.2 \, \text{m} \).

Step2: Apply potential energy formula

Use \( E_p = mgh \). Substitute values: \( E_p = 0.25 \times 10 \times 18.2 \).

Step3: Calculate the result

First, \( 0.25 \times 10 = 2.5 \). Then, \( 2.5 \times 18.2 = 45.5 \).

Answer:

45.5 J