# M1 help

Watch
Announcements
#1
(Take g = 10ms^-2 in this question)
A balloon is moving vertically upwards with a steady speed of 3ms^-1. When it reaches a height of 26m above the ground an object is released from the balloon. The balloon then accelerates upwards at a constant rate of 2ms^-2. Find:

i) The greatest height of the object above the ground
ii) the speed of the object as it strikes the ground
iii) the time taken by the object from leaving the balloon to striking the ground
iv) the speed of the balloon as the object strikes the ground

I just don't really understand this question so any help is really appreciated!!! :-)
0
5 years ago
#2
(Original post by czj1997)
(Take g = 10ms^-2 in this question)
A balloon is moving vertically upwards with a steady speed of 3ms^-1. When it reaches a height of 26m above the ground an object is released from the balloon. The balloon then accelerates upwards at a constant rate of 2ms^-2. Find:

i) The greatest height of the object above the ground
ii) the speed of the object as it strikes the ground
iii) the time taken by the object from leaving the balloon to striking the ground
iv) the speed of the balloon as the object strikes the ground

I just don't really understand this question so any help is really appreciated!!! :-)
What do you remember of the SUVAT equations?
1
#3
(Original post by Andy98)
What do you remember of the SUVAT equations?
basically the 5 equations... was recently introduced to this topic and my teacher rushed it through so I am a bit lost -

thought i could use the v^2 = u^2 +2as equation for the first part, substitute v=0, u=3, a=-10 (???) but I'm not sure where to go from there 0
5 years ago
#4
(Original post by czj1997)
basically the 5 equations... was recently introduced to this topic and my teacher rushed it through so I am a bit lost -

thought i could use the v^2 = u^2 +2as equation for the first part, substitute v=0, u=3, a=-10 (???) but I'm not sure where to go from there That looks right to me - just have to rearrange to get s

Posted from TSR Mobile
0
5 years ago
#5
Rule number one in mechanics: draw a graph! Even if one is given.

Write down what you know, v for final velocity, u for initial velocity, t for time, a for acceleration and s for displacement.

For SUVAT you'll need 3 known variables and the one you need I usually write it down as (in your case would be) s = ?.

You know a, u, v of the object. Select the equation with the 4.

v= u + at
s = 0.5t(v + u)
v^2 = u^2 + 2as
s = ut + 0.5at^2

iii) is the only one that I can see being a problem to you so here's a hint:u is given, v is taken from ii), a is given, s is given. So you can pick any equation for this, use multiple equations to verify your result.

Think about the direction. If you treat upwards as positive i.e. v = +3m/s then acceleration that's downwards (due to gravity) will obviously be...
0
5 years ago
#6
(Original post by Riesel)
Rule number one in mechanics: draw a graph! Even if one is given.

Write down what you know, v for final velocity, u for initial velocity, t for time, a for acceleration and s for displacement.

For SUVAT you'll need 3 known variables and the one you need I usually write it down as (in your case would be) s = ?.

You know a, u, v of the object. Select the equation with the 4.

v= u + at
s = 0.5t(v + u)
v^2 = u^2 + 2as
s = ut + 0.5at^2

iii) is the only one that I can see being a problem to you so here's a hint:u is given, v is taken from ii), a is given, s is given. So you can pick any equation for this, use multiple equations to verify your result.

Think about the direction. If you treat upwards as positive i.e. v = +3m/s then acceleration that's downwards (due to gravity) will obviously be...
Bit in bold ain't true.
0
5 years ago
#7
(Original post by Andy98)
Bit in bold ain't true.
Oh yes, sorry. Any equation with t. So not v^2 = u^2 + 2as but you can still plug in your numbers to verify the results.
0
5 years ago
#8
(Original post by Riesel)
Oh yes, sorry. Any equation with t. So not v^2 = u^2 + 2as but you can still plug in your numbers to verify the results.
Correct
0
X

new posts Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Have you experienced financial difficulties as a student due to Covid-19?

Yes, I have really struggled financially (47)
18.01%
I have experienced some financial difficulties (73)
27.97%
I haven't experienced any financial difficulties and things have stayed the same (100)
38.31%
I have had better financial opportunities as a result of the pandemic (32)
12.26%
3.45%