Abaseball is thrown vertically upward with an initial velocity of 30.0 m/s. the maximum height gained by the ball is?

45.9 m

Explanation:

We can solve the problem by using the law of conservation of energy. In fact, the mechanical energy (sum of gravitational potential energy and kinetic energy) of the ball just after it is thrown is equal to the mechanical energy of the ball when it is at the top of its trajectory:

where

is the initial gravitational potential energy of the ball, which is zero because the ball starts its motion from the ground (h=0)

is the initial kinetic energy of the ball, where m is the mass of the ball and v=30.0 m/s is its speed

is the gravitational potential energy of the ball at its maximum height h

is the kinetic energy of the ball when it is at the maximum height (it is zero because the speed of the ball at its maximum height is zero)

Substituting into the first equation, we can find h:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is