Answer:
30ft²
Explanation:
The area of the plywood that she has:
8 ⋅ 9
=72ft²
The area of the plywood she cut
7 ⋅ 6
=42ft²
The area discarded should be:
72ft² - 42ft²
= 30ft²
The statement that describes the change in energy as one slide from the top is the decrease in the gravitational potential energy is equal to the increase in kinetic energy.
<h3>What is Kinetic energy?</h3>
This is known to be a kind of energy that is seen in an object or a particle due to its motion.
Based on the above scenario, As the block goes or slides down, its potential energy is known to lower or decreases and its velocity is said to increases and therefore, it's kinetic energy is increasing.
See options below
O The decrease in the gravitational potential energy is equal to the increase in kinetic energy.
O The sum of the kinetic energy and the gravitational potential energy changes by an amount equal to the energy dissipated by friction.
The gravitational potential energy and the kinetic energy must both decrease.
The gravitational potential energy decreases, and the kinetic energy is constant.
Learn more about kinetic energy from
brainly.com/question/25959744
Answer:
C: No, the sample size for drug Y is large enough, but the sample size for drug X is not
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