An object of mass 20 kg is dropped from a height of 4 m. Fill in the blanks
in the following table by computing
the potential energy and kinetic
energy in each case.
E + EK
P
Height at
which object
is located
Potential Kinetic
energy energy
(E = mgh) (E = mc2/2)

Just above
the ground
For simplifying the calculations, take
the value of g as 10 m s2

PE = 800j, KE = 800J

Explanation:

To calculate the potential energy, we use the formula  

Potential Energy = Mgh

M = 20kg, g = 10m/sˆ2 , h = 4m

=20 × 10 × 4

=800J

At the maximum height  S = 4 and the initial velocity u = 0 The acceleration g = 10m/sˆ2

Using the third equation of motion

vˆ2 = uˆ2 + 2as

= 0ˆ2 + 2 × 10 ×  4

vˆ2 = 80

Kinetic Energy (KE) is given by  

KE = ½ mvˆ2

= ½ × 20 × 80

=800J  

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this

answer; first blank(1); 30% two(2); salmonella; i believe this is correct; //good luck;