Work done equals force times displacement

Steps:

• Recall the work-energy theorem: work W = F × d for constant force along the displacement.
• Identify that work depends only on the applied force F and distance d traveled.
• Note that mass m, time t, and speed v relate to motion but not directly to work calculation.
• Eliminate options requiring unnecessary quantities like m, t, or v.

Why A is correct:

• Work is defined as W = F × d, so F and d are the exact quantities needed.

Why the others are wrong:

• B: Mass m affects acceleration but not the direct work formula.
• C: Time t determines speed but is irrelevant to work.
• D: Speed v = d/t provides motion info but work requires d explicitly.

Final answer: A