Question

A 10 kg box initially at rest is pulled with a 50 n horizontal force for 4 m across a level surface. the force of friction acting on the box is a constant 20 n. what type of energy does the box have after it is done being pulled?

1. thanhha
The type of energy the box have after it is done being pulled is “kinetic energy”.

What is a Kinetic energy?

Kinetic energy is the type of energy which an item or particle has as a result of its motion. When work, that transfers energy, is performed on an item by exerting a net force, that object accelerates and obtains kinetic energy.
Now, according to the question;
The box’s mass, m = 10 kg
F = 50 N, the force that occurs when the box is pulled
It has been moved 4 meters.
Friction force operating upon that box, f = 20 N
We must determine the box’s initial kinetic energy. The box appears to be at rest at first. Because there is no movement in the box at the time.
The formula for box’s kinetic energy is as follows:
K.E = (1/2)mv²
As velocity is given zero; v = 0.
Thus, K.E = 0.
The initial velocity of the box is zero.
Therefore, as the box starts moving its zero kinetic energy will start increasing.
To know more about the kinetic energy, here
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