Question

How high of a hill should an 80-kg person climb to expend 40,000 joules of energy?

A. 4.1 km
B. 4.9 km
C. 51 m
D. 500 m

Answer 1

Answer:

1: 51 m

2: some energy was transformed to other forms

3: 3.24

4: 45j

5: 1020

Explanation:

Answer 2

The required height of hill is 51 m. Hence, option (C) is correct.

Given data:

The mass of person is, m = 80 kg.

The energy expended during climbing is, E = 40,000 J.

The energy possessed by the body by virtue of height is known as potential energy. In the given case, the energy expended by the person will be stored in the form of potential energy. Then,

E = U

E = mgh

here, h is the height of hill and g is the gravitational acceleration.

Solving as,

40000 = 80(9.8) h

h ≈ 51 m

Thus, we can conclude that the required height of hill is 51 m. Hence, option (C) is correct.

Learn more about the potential energy here:

https://brainly.com/question/17858145