Distinguishing scalars from vectors in physics quantities

Steps:

• Define vectors as quantities with magnitude and direction; scalars have only magnitude.
• Classify each quantity: kinetic energy (scalar, $\frac{1}{2}mv^2$), force (vector), velocity (vector, displacement over time), electric field strength (vector, force per charge with direction), momentum (vector, $mv$), time (scalar), weight (vector, $mg$ downward), temperature (scalar).
• Identify pairs: A (scalar + vector), B (vector + vector), C (vector + scalar), D (vector + scalar).
• Select the pair with both vectors: B.

Why B is correct:

• Both velocity and electric field strength are vectors, as they require direction (e.g., electric field $\vec{E} = \frac{\vec{F}}{q}$).

Why the others are wrong:

• A: Kinetic energy is scalar.
• C: Time is scalar.
• D: Temperature is scalar.

Final answer: B