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Throw a pen and measure gravity

We were given this question on a worksheet last lecture. The question is this:

‘Throw a tennis ball/your pen/some non-dangerous object into the air, straight up (and catch it again), observe its motion. Use your observation to measure the gravitational acceleration due to Earth [6 marks]’

So me and three of other people in this lecture just started discussing it. We started off by saying that it makes no sense, and trying to figure what it means.

In the end we said you would need a ruler to measure how high the object went and a stopwatch to measure time. You would then use s=ut 1/2at^2 where u = 0 and t is half the time measured between throwing and catching.

So that is how we would measure it. But the question says to observe the motion not to measure it?

QM
(edited 6 years ago)
I don’t know why the plus symbol isn’t showing. I type it in and it doesn’t show.

QM
(edited 6 years ago)
But you can’t ‘observe’ time :frown:

QM
(edited 6 years ago)
Do you think this is the kind of lecturer who would troll a class? http://www.hull.ac.uk/Faculties/staff-profiles/Elke-Roediger.aspx

QM
Thanks, although we used s= ut 1/2 at^2 ?

QM
(edited 6 years ago)
Hahaha that’s funny because Hull is a hell hole :lol:

QM

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