You serve a volleyball with a mass of 2.1kg. The ball leaves your hand at 30m/s. The ball has energy. Calculate it.

Explanation:

Given parameters:

Mass of volleyball = 2.1kg

Velocity = 30m/s

Unknown:

The nature of the energy possessed by the ball =?

Amount of this energy = ?

Solution:

As the ball is being served and it acquires velocity, it will have a kinetic energy.

Kinetic energy is the energy due to the motion of body. It is mathematically expressed as:

           K.E = m v ²

m is the mass of the body

v is the velocity

Insert the given parameters and solve;

        K.E = x 2.1 x 30²

       K.E = 945J

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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