Teacher Answers & Prompts

NexSolveAI O-Level Learning Hub™ · Original starter resource

1. a = F/m = 18/4 = 4.5 m/s².
2. a = (v−u)/t = (17−5)/4 = 3 m/s².
3. I = V/R = 9/30 = 0.30 A.
4. Q = It = 0.4 × 50 = 20 C.
5. v = fλ = 25 × 0.8 = 20 m/s.
6. Upward resistance balances weight. The resultant force is zero, so acceleration is zero while velocity remains constant.

Discussion prompts

Which quantity is the resultant force? How do you convert mA to A? Why does a constant velocity not imply the absence of forces?