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An object is dropped from a height of 25 meters. At what velocity will it hit the ground? A. 7. 0 meters/second B. 11 meters/second C. 22 meters/second D. 49 meters/second E. 70 meters/second.

Respuesta :

  • Initial velocity (u) = 0 m/s
  • Height (h) = 25 m
  • Acceleration due to gravity (a) = 9.8 m/s^2
  • Let the velocity with which the object hits the ground be v.
  • We know, for a freely falling body,

v^2 = u^2 + 2gh

  • Putting the values in the above equation we get,

v^2 = (0)^2 + 2 × 9.8 × 25

or, v^2 = 0 + 490

or, v^2 = 490

or, v = 22 m/s

Answer:

C. 22 meters/second

Hope you could get an idea from here.

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