Question

How much potential energy does a 20-kg barrel have when it is in the truck whose floor is 5.0 m above the ground

Answer 1

 20-kg barrel has 980J of potential energy when it is in the truck whose floor is 5.0 m above the ground

Potential energy is given as , P.E = Mgh
where, M = mass of the object
g = gravity = 9.8m/$sec^{2}$
h=height of the object from ground

Thus, P.E =  20-kg × 5.0 m × 9.8m/$sec^{2}$
                = 980J