Physics Question (1 Viewer)

[axwe7]

An astronaut on the moon drops a golf ball to determine the acceleration due to gravity. The time taken to fall through 1.2 m is 1.2 s. Determine the acceleration due to gravity on the moon.

I know that a = (v-u)/t

However the numerator states values based on velocity. Hence we should first use - V = s/t

s = 1.2
t = 1.2

Therefore Velocity = 1 ms-1, initial velocity @ astronaut = 0ms-1.

Therefore,
a = (1-0)/1.2
= 0.8333...

It's incorrect...

The answer is 1.6ms-1.

What am I doing wrong and what is method should be used to answer this question?

Regards,
Axwe7.

 

[Nailgun]

 

[axwe7]

Why can't I use the formula that I used before?

Thanks btw dude.

P.S Isn't it supposed to be s^2-2ut?

 

[Nailgun]

This link derives Newton's equations http://www.hitxp.com/phy/cph/071202.htm and if you have any trouble understanding I can go through it

 

[Nailgun]

EDIT:

P.S Isn't it supposed to be s^2-2ut?

um no lol

 

[InteGrand]

 

[Nailgun]

Oh whoopsie
Well, you'd get the same answer because u=0, but yeah lol

 

[InteGrand]

Oh whoopsie
Well, you'd get the same answer because u=0, but yeah lol

Ah right (didn't bother to read the actual question haha).

 

[Nailgun]

Where did your explanations go ahaha?

 

[axwe7]

Oh whoopsie
Well, you'd get the same answer because u=0, but yeah lol

So it's supposed to be 2ut?

 

[InteGrand]

So it's supposed to be 2ut?

Yeah, just an algebraic rearrangement. It made no difference here though as u was just 0, as Nailgun noted.

 

[Nailgun]

 

[axwe7]

NP dude, you still nailed it you gun

See whet I d1d Thair?

 

[axwe7]

Yeah, just an algebraic rearrangement. It made no difference here though as u was just 0, as Nailgun noted.

Thanks by the way

You always seem to help, not matter what.

 

[axwe7]

EDIT:

um no lol

Thanks man