A 1.00 kg rock is thrown up into the air from ground level at a speed of 8.00 m/s the ball travels up to a maximum height then returns to the ground calculate the rocks momentum as it strikes the ground

To find the force on the block, use Newton #1:  F = m A

Force = (2.3 kg) x (0.27 m/s²)

Force = (2.3 x 0.27) kg-m/s²

Force = 0.621 Newton

The spring stretches 1 meter when to pull with 18 N of force.

To pull with only 0.621 N of force, it only has to stretch (0.621/18) of a meter.  That's 0.0345 meter, or 3.45 cm .

The kinetic energy of the object which is moving with velocity of 9 m/s and has a mass of 20 kg will be 810 joules.

What is Kinetic Energy ?

The energy possessed by the body by virtue of its motion is called kinetic energy. Mathematically -

E[K] = 1/2mv²

Given is an object that has a velocity of 9 m/s and a mass of 20 kg.

We can calculate the kinetic energy of the object by using the formula discussed above.

Mass [m] = 20 Kg

Velocity [v] = 9 m/s

Substituting the values, we get -

E[K] = 1/2 x 20 x 9 x 9

E[K] = 10 x 9 x 9

E[K] = 81 x 10

E[K] = 810 joules

Therefore, the kinetic energy of the object which is moving with velocity of 9 m/s and has a mass of 20 kg will be 810 joules.

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Explanation:

k.e =1/2m(v)²

or

k.e=m/2(v)²

so......k.e=20kg/2(9m/s)²

k.e=10kg(81m²/s²)

k.e=10kg(81m²/s²)

k.e=810kgm²/s²

HOPE ITS CORRECT

ANSWER

k.e=810kgm²/s²

The formation of rust or the  iron oxide, is by the chemical reaction between iron and atmospheric oxygen. Hence, it is a chemical change involving the formation of new product.

What is a chemical change?

A chemical change is accompanied by the making or breaking or chemical bonds and the formation of new products. Whereas, a physical change does not involve the change in chemical bond. Phase transitions, change in size,shape etc.  are physical changes.

The rust formed in the iron material is iron oxide or Fe₂O₃. This process of forming rust by the action of air or water is called corrosion. Iron reacts with atmospheric oxygen or oxygen from water forms the rust.

The formation of rust makes the material destroy  and to prevent this process some anticorrosive materials have to be applied. Hence, formation of rust is a chemical change.

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