Post a New Question

physics

posted by on .

An object has a gravitational potential energy of 24 joules when it rests on a shelf 3 m above the ground. What would be its gravitational potential energy when it is lowered to a shelf 1 m above the ground?

o A. 8 joules

o B. 12 joules

o C. 22 joules

o D. 72 joules

  • physics - ,

    PE = mgh
    Therefore m = PE/(g x h)
    m = 24/(9.8 x 3)
    m = 0.82kg
    Now the object is moved to 1m above the ground.
    PE = mgh
    PE = 0.82 x 9.8 x 1
    PE = 8.036
    Round off to 8 (A)
    Alternatively, you could divide 24J by 3, as this is the change in height difference. But you may be marked down if proper work is not shown.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question