Vectors Flashcards
1
Q
The motion of a ball after being kicked is modelled as that of a prticle travelling with constant velocity (4i+9j) m/s.
Comment on the validity of this model for large values of t.
A
- model ignores friction & air R
- becomes ↓ accurate as t ↑
2
Q
How can we find the speed of a particles from its vector velocity ?
A
speed = magnitude of the vector
3
Q
Two non-zero vectors, a and b, are such that
∣a+b∣ = ∣a∣ + ∣b∣
Explain, geometrically, the significance of this statement. (1)
2019 pure q16
A
a and b lie in the same direction
