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Maths M1 Help Please
Hey, I'm finding mechanics slightly hard at the moment, please could some one help me with these questions.
8) The initial position of P at t = 0 is (2i + 4j)m. If it has velocity (3i– j)ms-1 find its position after
a. 3 seconds
b. t seconds
9) A bicycle is accelerating constantly. It initially has velocity of 10i ms-1. Ten seconds later its velocity is 6i + 8j ms-1. Find its acceleration.
Thanks for any help
8) The initial position of P at t = 0 is (2i + 4j)m. If it has velocity (3i– j)ms-1 find its position after
a. 3 seconds
b. t seconds
9) A bicycle is accelerating constantly. It initially has velocity of 10i ms-1. Ten seconds later its velocity is 6i + 8j ms-1. Find its acceleration.
Thanks for any help
You're gonna need to use the SUVAT equations.
S = ut + 1/2at^2 (add it from the initial position to get S)
V^2 = U^2 + 2as
S = ut + 1/2at^2 (add it from the initial position to get S)
V^2 = U^2 + 2as
Hi
To do 8)a. first find the displacemnt by multiplying 3 with the velocity which will give you 9i-3j. then to find the position add the initial position and the displacement: 2i+4j + 9i-3j = (11i+j)m
To do 8)b. find the displacemnt using the velocity and leave it in terms of t which should be 3ti-tj. then to find the position add the initial position and displacement but leave the answer in terms of t: (3t+2)i + (4-t)j
I hope this helps.
To do 8)a. first find the displacemnt by multiplying 3 with the velocity which will give you 9i-3j. then to find the position add the initial position and the displacement: 2i+4j + 9i-3j = (11i+j)m
To do 8)b. find the displacemnt using the velocity and leave it in terms of t which should be 3ti-tj. then to find the position add the initial position and displacement but leave the answer in terms of t: (3t+2)i + (4-t)j
I hope this helps.
EzPz
Please can you talk me through it ?
Tyvm!
Tyvm!
For the first one, you are given a time, initial velocity
t = 3 and initial velocity = (3i-j)
S = ut + 1/2at^2
to find it in t seconds, i think you just take away the time variable
last one you are given u, v and t
my bad, for this one you ALSO use s = ut +1/2at^2
Hi
To do 9) use this formula from SUVAT: v=u+at. u is the inital velocity of 10i and t is 10 seconds and v is the velocity 6i+8j. rearrange the formula to get a and then put in the velocities and time and you should get the answer.
I hope this helps.
To do 9) use this formula from SUVAT: v=u+at. u is the inital velocity of 10i and t is 10 seconds and v is the velocity 6i+8j. rearrange the formula to get a and then put in the velocities and time and you should get the answer.
I hope this helps.
boromir9111
For the first one, you are given a time, initial velocity
t = 3 and initial velocity = (3i-j)
S = ut + 1/2at^2
to find it in t seconds, i think you just take away the time variable
last one you are given u, v and t
my bad, for this one you ALSO use s = ut +1/2at^2
t = 3 and initial velocity = (3i-j)
S = ut + 1/2at^2
to find it in t seconds, i think you just take away the time variable
last one you are given u, v and t
my bad, for this one you ALSO use s = ut +1/2at^2
Here is my solution to part 1
Yeah, i didn't want to give the answer cause i got grilled last time for that. But "Steve2005" answer is correct.
For part 2, take away t i believe and just leave the answer in terms of t
For the last one just use S = ut + 1/2at^2 and you can find out S because t = 10
edit- if you don't understand the answers reply back and i will try to help as best as i can.
For part 2, take away t i believe and just leave the answer in terms of t
For the last one just use S = ut + 1/2at^2 and you can find out S because t = 10
edit- if you don't understand the answers reply back and i will try to help as best as i can.
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