> #answers > What is the velocity of the body when it is just about strike the ground where Mass of the body is 5kgs is raised to a height of 1.8metres?
###### Tumwine Godfrey
more than 4 weeks ago

# What is the velocity of the body when it is just about strike the ground where Mass of the body is 5kgs is raised to a height of 1.8metres?

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more than 4 weeks ago
To find the velocity of the body just before it strikes the ground, we can use the principle of conservation of energy.

The potential energy of the body at the initial height is given by:
PE = mgh
PE = 5kg * 9.8m/s^2 * 1.8m
PE = 88.2 Joules

At the ground level, all the potential energy is converted into kinetic energy. Therefore, the kinetic energy of the body just before striking the ground is equal to the potential energy at the initial height:
KE = PE
1/2 * m * v^2 = 88.2
1/2 * 5kg * v^2 = 88.2
2.5 * v^2 = 88.2
v^2 = 88.2 / 2.5
v^2 = 35.28
v = sqrt(35.28)
v ≈ 5.94 m/s

Therefore, the velocity of the body just before striking the ground is approximately 5.94 m/s.
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