C1 7546/7550/7600 A1 W (allow J s–1 and condone N ms–1) B1 3 (b) loss of GPE = 550 × 9.81 × 35 = 189 kJ C1 gain in KE = 0.5 × 550 × 222 = 133 kJ C1 resistance force = their difference/63 (890 N if correct) A1 answer to 2 sf if answer is from working even if incorrect) B1 4 (c) air resistance varies/increases B1 frictional force varies/increases B1 further detail: air resistance increases with speed/v or normal reaction force varies with angle of the slope B1 3 (d) use of F = mv2/r C1 arrives at r = 12 m (ignoring the weight) C1
C1 7546/7550/7600 A1 W (allow J s–1 and condone N ms–1) B1 3 (b) loss of GPE = 550 × 9.81 × 35 = 189 kJ C1 gain in KE = 0.5 × 550 × 222 = 133 kJ C1 resistance force = their difference/63 (890 N if correct) A1 answer to 2 sf if answer is from working even if incorrect) B1 4 (c) air resistance varies/increases B1 frictional force varies/increases B1 further detail: air resistance increases with speed/v or normal reaction force varies with angle of the slope B1 3 (d) use of F = mv2/r C1 arrives at r = 12 m (ignoring the weight) C1
BA84B3936F8867C4AA70879B0C4F7AFF.docx