A. speed
B. velocity
C. acceleration
D. retardation
Correct Answer: Option D
D. retardation
![An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]")
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