Question

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真的超不懂
有沒有厲害的人可以解答
不好意思 感謝

Xo=0
X
3-8 Solving Problems involving
Projectile Motion
Example 3-10: Level horizontal range.
(a) Derive a formula for the
y = 0 again here
horizontal range R of a projectile in yo = 0
(where x =R)
terms of its initial speed v, and angle
©. The horizontal range is defined as
the horizontal distance the projectile
travels before returning to its
original height (which is typically the
ground); that is, y(final) = yo. (b)
Suppose one of Napoleon's cannons
had a muzzle speed, vo, of 60.0 m/s.
At what angle should it have been
aimed (ignore air resistance) to
strike a target 320 m away?
R
60°
30°
35
en )