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Chente379
06.07.2019 •
Mathematics
Atennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 120 feet per second. after how many seconds does the ball attain it's maximum height?
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Ответ:
The maximum height is reached after 3.75 seconds.
Step-by-step explanation:
Assuming the deceleration due to gravity is unaided by air resistance, gravity causes the ball to lose vertical speed at the rate of 32 ft/s every second. The initial vertical speed of 120 ft/s will decline to zero when t satisfies ...
... 120 ft/s - (32 ft/s²)t = 0
... (120 ft/s)/(32 ft/s²) = t = 3.75 s
The ball will not go any higher after its vertical speed is zero.
Ответ:
sin(41) = 14/c
c = 14/sin(41)
c ≈ 21.34
c ≈ 21.3
a² + 14² = 21.3²
a² + 196 = 453.69
a² = 257.69
a ≈ 16.1