Question

A student lifts a 2.0 kg bag of apples one. 5 m above the floor. By how many joules has the potential energy of the bag of apples increased? (Assume g=10 m/s^2)

A.) 40 J
B.) 10 J
C.) 20 J
D.) 30 J

Answer 1

Answer:

30J

Explanation:

Given that a student lifts a 2kg bag of apples 1.5m above the floor . And we need to find out by how many joules the potential energy of the bag of apples has increased . We can find the P.E. by ,

$\longrightarrow P.E. = mgh$

where

• m is the mass of the body.
• g is acceleration due to gravity.
• h is the height above the ground.

Here ,

• m = 2kg
• g = 10m/s²
• h = 1.5m

On substituting the respective values,

$\longrightarrow P.E. = 2kg \times 10m/s^2\times 1.5m$

Multiply,

$\longrightarrow \underline{\underline{ P.E. = 30 J }}$

This is the required answer!