An object with mass of 50kg is dropping from a height of 25m. what is it’s velocity?

22.1 m/s

Explanation:

We can solve the problem by using the conservation of energy. The mechanical energy is equal to the sum of kinetic energy and potential energy, and it is constant:

where

m is the mass

v is the velocity

g is the gravitational acceleration

h is the heigth of the object

At the moment when the object is dropped, the velocity is still zero, so K=0 and all the energy is gravitational potential energy:

When the object reaches the ground, the height becomes zero: h=0, so the gravitational potential energy is zero and all the energy is now kinetic energy:

So, we can find the velocity:

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg