Potential/Elastic Energy and Conservation of Energy

The formula of Elastic Potential Energy is used basically when there is a SPRING?

• Yes

• No

In Potential Energy (also called Gravitational Potential Energy) the variable that gives the energy is the HEIGHT?

• Yes

• No

What is the SI unit of the constant of the spring (k) in Elastic Potential Energy?

• KN/cm

• N/m

• m/s

• kg

Can CONSERVATION OF ENERGY be solved ONLY using ONE type of energy?

• Yes

• No

To solve problems using CONSERVATION OF ENERGY we can choose from three types of energies: Kinetic Energy, Potential Energy and Elastic Potential Energy?

• Yes

• No

The potential energy of a 55-kg cannon ball is 26,000 J. How high was the cannon ball to have this much potential energy?

• 50.20 cm

• 48.19 m

• Needs more information to be solved

• 48 km

Determine the elastic potential energy stored in a spring with a spring constant of 250 N/m that is compressed 28.0 cm.

• $9.81\ \frac{m}{s^2}$
  

• Needs more information to be solved

• 9.8 J

• 98,000 J

Starting from rest, a child zooms down a frictionless slide from an initial height of 5.00 m. What is her speed at the bottom of the slide? Assume she has a mas of 30 kg. USE CONSERVATION OF ENERGY.

• 0.981 m/s

• 98.1 m/s

• 9.90 m/s

• 0.99 m/s

The value used for gravity to solve problems in Earth is  $9.81\ \frac{m}{s^2}$  ?

• Yes

• No