Question

By how much does the gravitational potential energy of a 54-kg pole vaulter change if her center of mass rises about 4.0 m during the jump

Answer 1

the gravational potential energy of anything on the ground is zero. When calculating potential energy you take height in meters and multiply it by the mass of the object in kilograms and the acceleration of gravity to get a new unit called Joules. Any object at ground level has a potential energy of zero newtons becuase anything multiplied by zero is zero. An object with mass of 54 kg, 4 meters above the ground has a gravitatinal potential energy of 2116.8 Joules.

Answer 2

Answer:

The gravitational potential energy of pole voulter is 2160\ J.

Explanation:

Given that,

Mass of the pole vaulter, m = 54 kg

Height it rises, h = 4 m

To find,

The gravitational potential energy.

Solution,

We know , gravitational potential energy of an object of mass m and height h is given by $m\times g\times h.$Here g is acceleration due to gravity=10 $m/s^2.$

$E=m\times g\times h\\=54\times 10 \times 4\ J=2160\ J.$

Therefore, the gravitational potential energy of pole voulter is 2160\ J.

Hence, this is the required solution.