An object is thrown with a fixed initial speed at various angles relative to the horizon

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

29. An object is thrown with a fixed initial speed

v_{0}

at various angles

\alpha

relative to the horizon. At some constant height

h

above the launch point the speed

v

of the object is measured as a function of the initial angle

\alpha

. Which of the following best describes the dependence of

v

\alpha

? (Assume that the height

h

is achieved, and assume that there is no air resistance.) (A)

v

will increase monotonically with

\alpha

. (B)

v

will increase to some critical value

v_{\text {max }}

and then decrease. (C)

v

will remain constant, independent of

\alpha

. (D)

v

will decrease to some critical value

v_{\text {min }}

and then increase.