Just one sec...
 You are Here: Home

# Help with this mechanics question?

Announcements Posted on
Take our short survey, ยฃ100 of Amazon vouchers to be won! 23-09-2016
1. I'm really stuck on 3d, can anyone help? The answer to b is (24U^2)/g and the answer to c is 5U but I can't get the answer to d for some reason. (Sorry for attaching a picture twice but I did it from my phone and idk how to get rid it)
Attached Images

2. The horizontal velocity is fixed so you can work out what the vertical velocity had to be too make the magnitude of the velocity that.

Then you know the starting vertical velocity and the vertical acceleration, so you can work out at what time the velocity equals this target value.

Does that approach make sense? The key is splitting it into horizontal and vertical components of motion.
3. (Original post by selenacxoxo)
I'm really stuck on 3d, can anyone help? The answer to b is (24U^2)/g and the answer to c is 5U but I can't get the answer to d for some reason. (Sorry for attaching a picture twice but I did it from my phone and idk how to get rid it)

therefore

Get a quadratic in and and complete the square on

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 22, 2016
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:
Today on TSR

### Justine Greening Q&A

Exam reform and more; post a question for the education secretary