Question

If a metal block of 120 kg is moved with a velocity of 4 m/s , the kinetic energy of the block will be _____________ Joules.

Answer 1

GIVEN:-

• Mass ,m = 120kg

• Velocity ,v = 4m/s

To Find:-

• Kinetic energy, K.E.

Solution:-

As we know that the energy produced in a body due to its motion is called Kinetic Energy.

• K.E = 1/2mv²

Substitute the value we get

→ K.E = 1/2×120 × 4²

→ K.E = 60 × 16

→ K.E = 960 J

Therefore, the kinetic energy of the block is 960 Joules.

Additional Information!!

✧ The rate of doing work is called power .

OR

The rate at which energy is transferred by an object is called the Power delivered by that object.

✧ SI unit of Power is Watt (W).

✧ Mathematical Term

⟹ P = W/t

✧ 1 horse Power = 746 Watt .

✧ The work done by a force acting on an object is equal to the product of force and the displacement of the object in the direction of the force.

✧ SI unit is Joule (J).

Answer 2

Answer:

$\bold\green{\underline{Given:}} Mass, ~m ~of ~block = 120kg \\ \\ \sf Velocity~,v = 4m/sec.$

$\bold\green{\underline{To\: find:}}Kinetic~energy$

$\bold\green{\underline{Solution:}} Formula~to~be~used = \dfrac{1}{2} mv²\\ \\ \sf \to \dfrac {1}{2} ×120×4² \\ \\ \to \dfrac {1}{2} × 1920 \\ \\ \implies 960 J$

$\bold {Kinetic~energy= 960 J}$