You are Here: Home >< Maths

# Suvat Q Watch

1. Would appreciate if someone could help on this suvat question, part 3.

A particle P is projected vertically downwards from a fixed point O with initial speed 4.2ms−1, and takes 1.5 s to reach the ground. Calculate
(i) the speed of P when it reaches the ground,
(ii) the height of O above the ground,
(iii) the speed of P when it is 5m above the ground.

I'm stuck on the third part of this question.
I got S as 5 , u as 4.2 , v as v , a as 9.8 .

V^2=U^2+2as , v= root(4.2^2+98) , v=10.7 which is wrong

Thanks , saw where the error was
2. Unless O is 10m above ground, the s in part iii should not be 5.

Updated: May 28, 2012
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

### HELP!

Mum wants to come to Freshers

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