2.Consider a projectile launched upward near the surface of Earth from the origin at some angle θ0 to the horizontal, with initial speed v0. The horizontal position x can be calculated as x = v0cosθ0t. On the other hand, under the influence of gravity with gravitational acceleration g, the height y can be expressed by a function of x as
(A)
(B) 
(C)
(D)
(E)
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統計: A(3), B(0), C(0), D(1), E(1) #3427002
統計: A(3), B(0), C(0), D(1), E(1) #3427002