Question

please solve this question and I need a full explanation... Question number 7 and 8 and I didn't understand the solution from this book.. Please give a proper explanation as tomorrow is my test and no spam otherwise direct report.
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Answer 1

I am giving a total explanation

hope it helps :)

Answer 2

Hey for qstion no. 7 ....the reqd unit vector is...... it is the formula to find the unit vector for a given vector. U hv to remember it. Its very very important.

hey for qstion 8 wht i did in the nxt step is dat a vector dot(.) a vector gives a^2cos0(since they are parallel as they the same vector) = a^2. i just reversed it and wrote them like that so that it bcms easier to solve. Hope it helps u tomorow!!