Which statement explains how gravity and inertia work together?

Physics

2 answers:

-Dominant- [34]3 years ago

6 0

A. They change the motion of objects

Rudik [331]3 years ago

3 0

Answer:

Therefore, A.They change the motion of objects.

Explanation:

Gravity force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Inertia : is a property of matter by which it continues in its existing uniform motion in a straight line, unless that state is changed by an external force.

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Answer:

A. ) K =126. 7 J

B. ) h= 91.1 m.

Explanation:

Assuming no air resistance, once released by the pitcher, the speed must keep constant through all the trajectory, so the kinetic energy of the ball can be expressed as follows:

$K = \frac{1}{2}*m*v^{2} = \frac{1}{2}*0.142 kg*(42.24m/s)^{2} = 126.7 J (1)$

Neglecting air resistance, total mechanical energy must be the same at any point, so, if we choose the ground level as the zero reference level for the gravitational potential energy, and assuming that the ball attains this kinetic energy just before striking ground, this value must be equal to the gravitational potential energy just before be dropped, so we can write the following equality:

$U_{o} = K_{f} = 126. 7 J (2)$

⇒ m*g*h = 126. 7 J

Solving for h, we get:

$h = \frac{K_{f}}{m*g} = \frac{126.7J}{0.1420kg*9.8m/s2} = 91.1 m (3)$

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