Vector quantities require magnitude and direction

Steps:

• Define vector quantity as one with both magnitude (size) and direction.
• Examine each option for presence of explicit direction.
• Identify force in A as having direction ("upwards").
• Confirm others lack direction, making them scalars.

Why A is correct:

• Force (N) is a vector per Newton's laws, needing magnitude and direction for complete description.

Why the others are wrong:

• B: Mass change (kg) is scalar; "decrease" implies only magnitude.
• C: Temperature change (kg, likely typo for °C) is scalar; "cooler" lacks direction.
• D: Time (s) is scalar; "later" indicates sequence, not spatial direction.

Final answer: A