What does a negative velocity mean?
To understand this question, it is important to know that velocity has both a direction and a magnitude. The magnitude can be expressed by the unit m/s, however the direction is expressed by a vector. To distinguish between two directions in velocity, you can have a positive and a negative vector: vectors that point in the opposite direction. Therefore, a negative velocity means that the direction of that velocity is opposite to the other velocity (with the positive value).
TD
Related Physics A Level answers
All answers ▸A wire has length l, cross-sectional area a, resistivity p and resistance R. It is compressed to a third of its original length but its volume and resistivity are constant. Show its new resistance is R/9.
What is a vector quantity
A ball with radius 10cm is filled with an ideal gas at pressure 2*(10)^5Pa and temperature 300K. The volume of the gas is changed at constant pressure so that the radius of the ball is reduced with 1cm. Find the amount of gas and the new temperature
What's the difference between a bayron and a meson?