Question

The displacement of a particle is given by x(t)=4t2 +8t meter. Its velocity at t = 5 second is
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Answer 1

Answer:

v = 8t + 8

v = 40 + 8 = 48m/s

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Answer 2

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given, x(t) = displacement(d) = 4t²+8t

also given, t = 5s

we know velocity(v) = d/t

so, v = (4t²+8t)/t

= (4(5²)+8(5))/5

= (100+40)/5

= 140/5

= 28ms⁻¹

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