If 2.0 J of work is done in raising a 180g apple, how far is it lifted?
1 Answer
Jun 25, 2016
1.14 meters
Explanation:
You have already learned that work and energy have same units i.e. Joule (J).
If the object has travelled some distance (upwards) then there must be some potential difference (increased potential energy).
Thus the energy needed to lift the ball can be found by this formula:
Where
Now we know the energy(2 J), the mass (0.18 kg), and gravitational energy (9.8 m/s^2). Putting into the formula we get:
Finally,
height reached above the ground = 1.14 m