BIO Human Energy vs. Insect Energy.
For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.0-mm-long, 0.50-mg flea can reach a height of 20 cm in a single leap. Ignoring air drag, what is the takeoff speed of such a flea?

The takeoff speed of the flea is 1.98 m/s.

Explanation:

Consider upward direction as positive and downward direction as negative.

Given:

Length of the flea (L) = 2.0 mm

Mass of the flea (m) = 0.50 mg

Maximum height reached by the flea (h) = 20 cm = 0.20 m [1 cm =0.10 m]

At maximum height, velocity is 0. So, final velocity (v) = 0 m/s

Acceleration of the flea is only due to gravity (g) = -9.8 m/s² (Down)

Let the initial takeoff velocity be 'u' m/s.

We know that, from kinetic equation of motion, the final velocity is related to initial velocity, acceleration and displacement as:

Where, 'a' and 'S' are the acceleration and displacement of the body respectively.

As per question,

m/s²

Plug in the given values and solve for 'u'. This gives,

Therefore, the takeoff speed of the flea is 1.98 m/s.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force