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Quadratic Polynomial

If the speed ...

Question

If the speed of a particle in a tube is given by, S(t) = $t^{2} - 5 t + 4$ m/s ( where t is time in seconds), then the speed at t = 5 seconds is m/s.

A

4

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B

5

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C

25

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D

16

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Solution

The correct option is A 4
S(t) = $t^{2} - 5 t + 4$
at t = 5 s, S(5) = $5^{2} - 5 (5) + 4$ = 4 m/s.

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