Intro to Conservation of Energy Video Lessons

Video Thumbnail

Concept

Problem: A 30 N ball and a 80 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate?a) Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball.b) The heavy ball has a greater acceleration and falls faster.c) The light ball has a greater speed since it can accelerate faster than the heavy ball.d) After 1 second has elapsed, both balls have the same kinetic energy since they have the same acceleration.

FREE Expert Solution

In this problem, we're going to apply the conservation of energy. 

mgh=12mv2

We can then solve for v as:

94% (224 ratings)
View Complete Written Solution
Problem Details

A 30 N ball and a 80 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate?

a) Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball.

b) The heavy ball has a greater acceleration and falls faster.

c) The light ball has a greater speed since it can accelerate faster than the heavy ball.

d) After 1 second has elapsed, both balls have the same kinetic energy since they have the same acceleration.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intro to Conservation of Energy concept. You can view video lessons to learn Intro to Conservation of Energy. Or if you need more Intro to Conservation of Energy practice, you can also practice Intro to Conservation of Energy practice problems.