Question

An object of mass 25 kg starting from rest is moving with a uniform velocity of 10 m/s . What is the kinetic energy possessed by the object?

Answer 1

1250 J is the required answer.

GIVEN:

• Mass of the object, m = 25 kg.
• Uniform velocity , v = 10 m/s

TO FIND:

Kinetic energy possessed by the object, k

FORMULA

Kinetic energy, k = mv²/2

SOLUTION:

$k = \frac{1}{2} m {v}^{2} \\ \\ k = \frac{1}{2} \times 25 \times {(10)}^{2} \\ \\ k = \frac{1}{2} \times 25 \times 100 \\ \\ k = \frac{2500}{2} \\ \\ k =1 250 \: joule$

ANSWER:

Kinetic energy possessed by the object is 1250 J.

KINETIC ENERGY:

• It is the energy possesed by the object by virtue of its motion.

• The capacity to do work is called energy.

• The two types of mechanical energies are potential energy and kinetic energy.

• Potential energy is the energy possesed by the object by virtue of its position.

• Kinetic energy of a particle at rest is zero because its velocity is zero.

• Kinetic energy is a scalar quantity. It has magnitude only. It has no direction.

Answer 2

Answer:

1250J (joules)

Explanation:

Mass (m)= 25kg

Velocity (v)= 10m/s

Kinetic energy= ½mv²

Now, putting values accordingly,

Kinetic energy= ½*25*(10)²

= ½*25*100

= ½*2500

= 1250 J