Vectors 3d mechanics pure

https://imgur.com/a/Cf67Iw7

Could someone help me with this question please the one below d.

I end up with a quadratic which gives me decimal answers when I factorise and the book says the answers are -3 and -7/3 and I’m not sure where I’ve gone wrong.

Any help would be greatly appreciated! Thank you

Reply 1

mqb2766

Original post

by username79352

https://imgur.com/a/Cf67Iw7
Could someone help me with this question please the one below d.
I end up with a quadratic which gives me decimal answers when I factorise and the book says the answers are -3 and -7/3 and I’m not sure where I’ve gone wrong.
Any help would be greatly appreciated! Thank you

Looks like a typo in the question. Either the mass should be 1 kg or the acceleration should be 1m/s^2. In other words the magnitude of the resulting force should be 5, not 25.

Reply 2

username79352

Ohhh ok, I just kept on thinking I was doing something wrong. I spent far too long on this. Thank you!! :smile:

Reply 3

mqb2766

Original post

by username79352

Ohhh ok, I just kept on thinking I was doing something wrong. I spent far too long on this. Thank you!! :smile:

What you did was fine, but it wasnt necessary to take the 5 over to the right and inside the sqrt(), then take it back out and over to the left. Just write / go from
|F| = m|a|
and obviously you want to square both sides to get rid of the sqrt() on the left.

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