An object is shot vertically upward into the air with a positive initial velocity. what correctly describes the velocity and acceleration of the object at its maximum elevation?
velocity acceleration
(a) positive positive
(b) zero negative
(c) positive negative
(d) zero zero
(e) negative negative

option (B)

Explanation:

According to the vector analysis, the upward direction is taken as positive and the downward direction is taken as negative.

Similarly, the rightward direction is taken as positive while the leftward direction is taken as negative.

As the object is hot vertically upwards so the direction of velocity is taken as positive as given in the question.

At the maximum height, the velocity is zero.

The acceleration acting on the object is acceleration due to gravity which is always acting downwards so it is taken as negative.

Thus, option (B) is true.

  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

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.