How come the answer is A (it is less). It should be B (it is the same). The answer explanation uses delta(x)= v1*delta(t)+1/2 a*delta(t)^2 but then goes on to input t=1 and t=2 into the delta(t) part of the formula separately and then subtracting the two answers. The explanation does the same for t=3 and t=4. It should instead be the difference of t=1 and t=2/ t=3 and t=4, making the answer B.
Even using common sense, the acceleration is constant (9.8 m/s^2) in the free fall question and also the velocity is constant (proven by the previous question, Q20), the differences should have the same distances of apprx 5 m.
Can someone please tell me if I misunderstood or if the book's answer is incorrect
Math and Physics Section 1 Content Review Problems Q21

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Re: Math and Physics Section 1 Content Review Problems Q21
Are you using the old editions of the books? I ask because I looked through the current version of our Physics content review book and I couldn’t find the question you were referring to.