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A golfer hit a golf, horizontal distance d (m) and the ball height of the rise in h (m) satisfy the

KRF1Z2010-02-14 23:11:06 +0000 #1
a golfer hit a golf, horizontal distance d (m) and the ball rise the height h (m) satisfy the relationship:

a golfer hit a golf, horizontal distance d (m) and the ball height of the rise in h (m) satisfy the relationship: h = d-0.004d ^ 2

(1) When the ball fly a 90m long, its height increases in the number of?

(2) When the ball for the first time to reach 50m height, it had to fly How far? (Accurate to 1m)
fupengfei01012010-02-14 23:24:17 +0000 #2
h = d-0.004d ^ 2

When the ball flew 90m long, that is d = 90; into the formula;

get h = 57.6m;

When the ball for the first time to reach 50m height, that is h = 50;

50 = d-0.004d ^ 2

get; d = 69m; or 181 (rounding)

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