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Question

Question: The displacement of a particle is given by \(y = a + bt + ct^{2} - dt^{4}\). The initial velocity a...

The displacement of a particle is given by

y=a+bt+ct2dt4y = a + bt + ct^{2} - dt^{4}. The initial velocity and acceleration are respectively

A

b,4db, - 4d

B

b,2c- b,2c

C

b,2cb,2c

D

2c,4d2c, - 4d

Answer

b,2cb,2c

Explanation

Solution

y=a+bt+ct2dt4y = a + bt + ct^{2} - dt^{4}

6muv=dydt=b+2ct4dt3\therefore\mspace{6mu} v = \frac{dy}{dt} = b + 2ct - 4dt^{3} and a=dvdt=2c12dt2a = \frac{dv}{dt} = 2c - 12dt^{2}

Hence, at t = 0, vinitial = b and ainitial = 2c.