You are Here: Home >< Maths

# M2 energy and work question help. watch

1. Hi,

I've done parts i. and ii. however I'm stuck on part iii.

If you have the loss of mechanical energy due to air resistance how do you work out the magnitude of the air resistance on the ball? And then, how do you work out the speed at which the ball lands.

The gain in potential energy is 8.76J.
The loss of mechanical energy due to air resistance is 3.24J.

Thanks
2. (Original post by VioletPhillippo)
Hi,

I've done parts i. and ii. however I'm stuck on part iii.

If you have the loss of mechanical energy due to air resistance how do you work out the magnitude of the air resistance on the ball? And then, how do you work out the speed at which the ball lands.

The gain in potential energy is 8.76J.
The loss of mechanical energy due to air resistance is 3.24J.

Thanks
Attached Images

3. (Original post by VioletPhillippo)
Loss of mechanical energy = work done against air resistance
= maginude of air resistance x distance travelled

How far has it travelled on the way up?

Then it will lose more mechanical energy on the way down.
4. (Original post by tiny hobbit)
Loss of mechanical energy = work done against air resistance
= maginude of air resistance x distance travelled

How far has it travelled on the way up?

Then it will lose more mechanical energy on the way down.
Thanks so much, I completely forgot about work done= force × distance!

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 2, 2017
Today on TSR

### Edexcel GCSE Maths Unofficial Markscheme

Find out how you've done here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams