Question

1. The displacement of a point moving is straight line is given by
s = 4t2 + 5t - 6
Here s is in cm and t is in sec. calculate
(i) Initial speed of particle
(ii) Speed at t = 45
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Answer 1

Answer:     Solution :

(i) Speed, v=dsdt=8t+5 Initial speed (i.e at t=0), v=5cm/s

(ii) At t=4s,v=8(4)+5=37cm/s