MAV 2006 Exam 2, Question 20

[Mxbn0]

Hey all,

Just a quick query about a vectors question.

The question is "When forces of 3i-2j and i+5j newton simultaneously act on a 0.5kg object, its acceleration, in ms^-2, will be?"

The given answers are either 2.5, 5, 10, 2i+1.5j, or 8i+6j.

The correct answer they state is E, 8i+6j, but why wouldn't C, 10 ms^-2 be the correct answer?

Note: I copied out the question word for word and it didn't state whether the answer was in vector form or not. Any ideas?

[Over9000]

Hey all,

Just a quick query about a vectors question.

The question is "When forces of 3i-2j and i+5j newton simultaneously act on a 0.5kg object, its acceleration, in ms^-2, will be?"

The given answers are either 2.5, 5, 10, 2i+1.5j, or 8i+6j.

The correct answer they state is E, 8i+6j, but why wouldn't C, 10 ms^-2 be the correct answer?

Note: I copied out the question word for word and it didn't state whether the answer was in vector form or not. Any ideas?

They didnt ask for the magnitude of the acceleration, 10ms^{-2} is the magnitude of the acceleration, you need to give the acceleration in vector component form unless otherwise stated.

[Mxbn0]

Ahk, thanks for that, ill remember it for tomorrow