Note: This is part 2nd of a 4 part question, split as 4 separate questions here.

- If $s=f(t)$ is the distance function, representing the distance 's' travelled by a particle in time t, then the velocity and acceleration functions are $v=\large\frac{ds}{dt}$$=t'(t)$ and $a=\large\frac{d^2s}{dt^2}=f''(t)$
- When a particle starts from rest,velocity v and time t are 0. When a particle is thrown up, it reaches maximum height at which $v=0$ and then falls back to earth. When a moving particle comes rest, $v=0$
- If $y=f(x)$ then $\large\frac{dy}{dx}$$=f'(x)$ is the rate of change of $y$ w.r.t $x$
- $\large\frac{dy}{dx_{(x_1,y_1)}}$ is the slope of the tangent to the curve at the point $(x_1,y_1) $ on the curve. It is the slope of the curve at that point.
- The normal at a point $(x_1,y_1)$ on $y=f(x)$ is perpendicular to the tangent at $(x_1,y_1)$

$x=100t-\large\frac{25}{2}$$t^2$

When the missile reaches maximum height, velocity=0

Therefore $\large\frac{dx}{dy}$$=0$

$\qquad=>100-25t=0$

$\qquad=>t=4 \;secs$

Therefore maximum height is reached at $t=4\;secs$

Hence A is the correct answer

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