Unit vector does not have any .......

$100$ coplanar forces each equal to $10 \,N$ act on a body. Each force makes angle $\pi /50$ with the preceding force. What is the resultant of the forces.......... $N$

When three forces of $50 \,N, 30\, N $ and $15\,N$ act on a body, then the body is

A plane covers $500 \,m$ in direction $60^o$ with run-way while starting the flight. Find the distance covered by plane in horizontal and vertical direction.

Any vector in an arbitrary direction can always be replaced by two (or three)

If a unit vector is represented by $0.5\hat i + 0.8\hat j + c\hat k$, then the value of ‘$c$’ is