The question discussed in this issue is about the motion of a skydiver. This context has been chosen because it can be analysed using Newton’s laws of motion. A key idea here is that one of the forces involved — the air resistance force on a moving object — is not constant, but increases with its speed. You are not expected to know the details of the relationship between force and speed; this information is given in the question.
What matters in questions like this is approaching them systematically, ensuring there is structure and clear reasoning in your descriptive responses and showing clearly how you are tackling any parts that involve calculations. The latter is very important because of the error carried forward rule. An examiner will give full credit if an incorrect value from a previous calculation is substituted correctly in a subsequent calculation. So it is in your interests to show all steps of a calculation, so that it is easy to see how you have gone about it.
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