The body’s velocity equation has the form: v = 5 + 2t. Find the movement of the body in the fourth second.

the whole catch of this problem consists in the words “Find the movement of the body in the fourth second.” So that you understand, not in 4 seconds, but in this fourth second, i.e. for one
then v = 5 + 2 * 1 = 7
s = Vt = 7 * 1 = 7
Answer: 7

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