Question

7. A ball was thrown vertically upwards from a point A on the ground. The height of the ball
above the ground, 1 seconds after being thrown, was s metres, where s=25t – 5t^2
(a)Calculate the height, in meters of the ball above the ground 1 second after it was thrown.
(b)Find an expression, in terms oft, for the speed of the ball after t seconds.
Calculate
(c)the speed with which the ball was thrown.
(d)the value of t when the speed of the ball was zero.
(e)the greatest height above A that the ball reached
(f) the time which elapsed from when the ball was thrown
until it was first at a height of 30 metres
above A.
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Answer 1

Answer:

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