Question

an object of mass 50kg is raised to a height of 8m above the ground.Find the potential energy? Also find the kinetic energy, if the object is allowed to fall, when it is half way down.​

Answer 1

Explanation:

potential energy = Mgh

= 50*10*8

= 4000 J

Answer 2

Answer:

An object of mass 50kg is raised to a height of 8m above the ground.

The potential energy

PE = mgh = 50*9.8*8 = 3920 J

The final velocity is,

${v}^{2} - {u}^{2} = 2as \\ {v}^{2} = 2 \times 9.8 \times 8 \\ {v}^{2} = 156.8 \\ v = 12.52 \: \frac{m}{s}$

The kinetic energy is,

$ke \: = \frac{1}{2} m {v}^{2} \\ ke = \frac{1}{2} \times 50 \times \times 156.8 = 3920 \: j$