Question

a block weighing 18 n is lifted 7m vertically upward how much is the potential energy stored in it?​

Answer 1

Answer:

Here ,

Weight(mg)=20N

Height (h)=6m

Now, potential energy(PE)=mgh

=20×6=120Joules

Explanation:

Answer 2

Given: A block weighing 18 n is lifted 7m vertically upward.

m = 18 N

h = 7 m

To find: Potential energy

Potential energy is the energy stored in a body because of the work done on it. If a body is lifted, then work is done against gravitational energy. This energy is stored in the form of potential energy in the body.

Thus, potential energy also depends upon the mass of the body as huge mass means more work is done on it.

Solution:

PE = mgh

PE = 18 * 9.8 * 7

$PE = 1234.8\: kg\: m^{2}/s^{2}$

$PE = 1234.8\: kg\: m^{2}/s^{2}\:\:(\because 1J = \: kg\: m^{2}/s^{2})$

Answer:

The potential energy of the given block of weight 18 N lifted 7 m vertically upward is 1234.8 J.