A 250-Kg Projectile Is Launched at an Angle of 20

question 9

Multiple Choice

A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high.If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m,how much work has been done on the projectile by air friction?

• A)-3.3E+3 J
• B)1.7E+2 J
• C)-3.5E+3 J
• D)2.4E+4 J

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Definitions:

Radius

The distance from the center of a circle to any point on its circumference.

Center

In geometry, the central point of a circle or sphere, equidistant from all points on the perimeter or surface.

Radius

A line segment from the center of a circle to any point on its circumference, or the length of this segment.

Equation

A mathematical statement that asserts the equality of two expressions.