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Q7. The distance, S metres, moved by a body after t second is given by:
s = 80 t - 8t².
Determine EACH of the following for the body:
(a) the initial velocity; (3)
(b) the velocity after 3 seconds; (1)
(c) the acceleration after 2 seconds; (2)
(d) the time when the velocity is zero; (2)
(e) the distance travelled before coming momentarily to rest; (2)
(f) the time when passing the starting point; (3)
(g) sketch s = 80 t - 8t² fot 0 ≤ t ≤ 10. (3)