Vertical motion and qudaratic equation questions

1. Aug 3, 2011

jmathew13

1. a cricket ball is thrown at 20 metres per second . how high will it be after 1 second?

I will subtitute the values in -4.9x1^2 - 20-1

2. any way the formula is -4.9t^2 - ut

3. I think the answer is -4.9-21

Sorry for hurry, it is due tomorrow

Last edited: Aug 3, 2011
2. Aug 3, 2011

sjb-2812

Thrown in what direction? ut is not the same as u-t, either

3. Aug 3, 2011

jmathew13

sorry then it is -20 so do u know who to do it?????????/
the question says it is vertical motion so it should be thrwon vertically

Last edited: Aug 3, 2011
4. Aug 3, 2011

PeterO

All the equations you have, involve 4 of the following
u,v,s,a,t [some people use d instead of s].
You could start by listing the values for the ones you know, and identifying the one you want, then chose the formula involving those variable, then carefully solve.

Your solution should always start with the formula written out, just to show that you know what you are trying to do.

5. Aug 3, 2011

sjb-2812

Vertically upwards (probably, given the wording of the question, but I am still not sure), or vertically downwards?

You have initial velocity, time and acceleration. What formula(s) do you know that can link this to position?