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Question

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

The displacement of the particle is given by

y=a+bt+ct2dt4.y = 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

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

∴ v = dydt=0+b+2ct4dt3\frac{\mathbf{dy}}{\mathbf{dt}}\mathbf{= 0 + b + 2ct}\mathbf{-}\mathbf{4d}\mathbf{t}^{\mathbf{3}}

Putting t=0,t = 0, vinitial = b

So initial velocity = b

Now, acceleration (1) =dvdt=0+2c12dt2= \frac{dv}{dt} = 0 + 2c - 12dt^{2}

Putting t = 0, ainitial = 2c