A Projectile Is Launched from the Edge of a Cliff

question 45

Multiple Choice

A projectile is launched from the edge of a cliff with a velocity of 10.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity of the projectile 2.00 seconds later (ignoring air resistance, and assuming it hasn't reached the ground yet) ?

• A) V_x = 8.7 m/s, V_y = −14.6 m/s
• B) V_x = 14.6 m/s, V_y = −5.6 m/s
• C) V_x = −8.7 m/s, V_y = −14.6 m/s
• D) V_x = −14.6 m/s, V_y = 8.7 m/s
• E) V_x = 5.6 m/s, V_y = −14.6 m/s

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Definitions:

Final Control Element

The component in a control system that directly regulates the flow of energy or material in the process, such as a valve or actuator.

Time Proportioning Control

A control method where the output is turned on and off at a rate proportional to the error value, used in PID controllers, for precise control.

On Time

Refers to the condition or state of being operational or active at the expected or scheduled time.

Off Time

Represents the period when a system or component is not operating or is inactive.