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question

An ion RMM 40 g initially moving at 100 ms-1 in a vacuum is subject to a constant acceleration of 1000 ms-2 for 2 s. Calculate the final speed of the ion in ms-1.

Can anyone help with this? :c
Original post by jacksonmeg
An ion RMM 40 g initially moving at 100 ms-1 in a vacuum is subject to a constant acceleration of 1000 ms-2 for 2 s. Calculate the final speed of the ion in ms-1.

Can anyone help with this? :c


Choose a SUVAT equation.

You are given the initial speed (u) and told both the acceleration (a) and time (t).

Which one do you think suits the problem given you are asked to find the final velocity (v)?
Reply 2
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jacksonmeg
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Original post by uberteknik
Choose a SUVAT equation.

You are given the initial speed (u) and told both the acceleration (a) and time (t).

Which one do you think suits the problem given you are asked to find the final velocity (v)?

v = u + at?
Original post by jacksonmeg
v = u + at?
Correct. :smile:
Reply 4
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jacksonmeg
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Original post by uberteknik
Correct. :smile:

so the mass doesn't effect it? sorry i'm studying chemistry I don't understand :L
Original post by jacksonmeg
so the mass doesn't effect it? sorry i'm studying chemistry I don't understand :L
Not in this problem because you are already given the acceleration.

Force = Mass x Acceleration

therefore:

Acceleration = Force / Mass

Hence a force acting on the RMM 40g mass has produced the stated acceleration.
(edited 9 years ago)
Reply 6
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jacksonmeg
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Original post by uberteknik
Not in this problem because you are already given the acceleration.

Force = Mass x Acceleration

therefore:

Acceleration = Force / Mass

Hence a force acting on the RMM 40g mass has produced the stated acceleration.

ahh I see, thanks
Reply 7
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jacksonmeg
OP
11
Original post by uberteknik
Not in this problem because you are already given the acceleration.

Force = Mass x Acceleration

therefore:

Acceleration = Force / Mass

Hence a force acting on the RMM 40g mass has produced the stated acceleration.

for this

An ion RMM 44 g initially moving at 100 ms-1 in a vacuum is subject to a constant deceleration of -1000 ms-2 for 0.1 s. Calculate the final speed of the ion in ms-1.

would I use the same formula but just do

100 + -1000*0.1?
Original post by jacksonmeg
for this

An ion RMM 44 g initially moving at 100 ms-1 in a vacuum is subject to a constant deceleration of -1000 ms-2 for 0.1 s. Calculate the final speed of the ion in ms-1.

would I use the same formula but just do

100 + -1000*0.1?
Exactly.

The forward velocity is completely arrested.
(edited 9 years ago)

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