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.
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
B.Complex Machine
C.Compound Machine
D.Simple Machine
A rake is a simple machine. Thus, the correct option is D.
A simple machine is a mechanical device which changes the direction or magnitude of an applied force. In general, these machines can be defined as the simplest mechanisms which uses mechanical advantage also called as leverage to multiply the force. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists including lever, wheel and axle, pulley, inclined plane, wedge, and screw.
A simple machine uses a single applied force to do the work against a single load force or friction. Ignoring the friction losses, the work done on the load force is equal to the work done by the applied force.
Therefore, the correct option is D.
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