You are Here: Home >< Maths

# Mechanics Kinematics help!

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016

A lift ascends from rest with an acceleration of 0.5m/s/s before slowing with an acceleration of -0.75m/s/s for the next stop. If the total journey time is 10 seconds, what is the distance between the two stops?

Clare is driving along a road in her car, with Henry following 40m behind his car. They are both travelling at 25m/s. Clare spots a problem ahead, and brakes to a halt, with acceleration -5m/s/s. Henry takes 0.2 seconds to react, then brakes, but his brakes are less well maintained and only provide an acceleration of -4m/s/s. Investigate what happens.

I'm really weak at these types of combine kinematics. If you have any tips on solving these kind of problems better please let me know too
2. (Original post by liemluji)

A lift ascends from rest with an acceleration of 0.5m/s/s before slowing with an acceleration of -0.75m/s/s for the next stop. If the total journey time is 10 seconds, what is the distance between the two stops?

Clare is driving along a road in her car, with Henry following 40m behind his car. They are both travelling at 25m/s. Clare spots a problem ahead, and brakes to a halt, with acceleration -5m/s/s. Henry takes 0.2 seconds to react, then brakes, but his brakes are less well maintained and only provide an acceleration of -4m/s/s. Investigate what happens.

I'm really weak at these types of combine kinematics. If you have any tips on solving these kind of problems better please let me know too
For your first one, split it up into two distinct stages and don't be afraid to get some unknown parameters going that you can then find/solve.

## 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: June 18, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams