When 100 J are put into a device that puts out 40 J, the efficiency of the device is A. 40%. B. 50%. C. 60%. D. 140%.
1 answer:
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Answer:
Option (c).
Explanation:
An object when when projected at an angle, will have some horizontal velocity and vertical velocity such that,
is the angle of projection
The horizontal component of the projectile remains the same because there is no horizontal motion. Vertical component changes at every point.
As a projectile falls, vertical velocity increases in magnitude, horizontal velocity stays the same .