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Physics help AS level?

Hiya so I'm doing "suvat" questions, and I've been given this question but im not sure what to fill in where, and what equasion I must use? The question is
"Joe drops a ball on ben's foot. How long does the ball take to fall 1m?"
I know the displacement is 1m and the acceleration is 9.81m/s I think? Just a bit stuck though really appreciate the help, thanks!
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Avatar for Boople
Boople
10
Original post by Tarlius
Hiya so I'm doing "suvat" questions, and I've been given this question but im not sure what to fill in where, and what equasion I must use? The question is
"Joe drops a ball on ben's foot. How long does the ball take to fall 1m?"
I know the displacement is 1m and the acceleration is 9.81m/s I think? Just a bit stuck though really appreciate the help, thanks!


S = 1 (as you've said)
U = 0 (as its starting from a stand still)
V = / (we do not need this)
A = 9.81 (as the ball is falling under gravity - as you've said)
T = ? (what we want to find out)

As we do not want V, we want the equation s=ut+1/2at^2

1=(0)(t)+1/2(9.81)(t)^2
1=4.905t^2
1/4.905=t^2
t=0.452 seconds (3 sig fig)

Hope that helps!
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Avatar for Tarlius
Tarlius
OP
1
ah yes! I see now, thank you very much have a nice evening :smile:

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