Question

a body of mass 10 kg is started from rest then find work done to increase its velocity of 15 metre per second.
please tell the answer anyone​

Answer 1

¶Given¶

• Mass of body ,m = 10kg

• Initial velocity ,u = 0m/s

• Final velocity ,v = 15m/s

¶To Find¶

• Work done ,W

¶Solution¶

As we know that work done is defined as the force acting on a body produce displacement along the force acting .

W = FS

Now,

As we know that Work Energy theorem states that energy can neither be created or nor be destroyed . It can be transferred from one state to another . So, here the energy is transferred into kinetic energy.

Using Work-Energy theorem.

W = KE

• KE = 1/2mv²

Substitute the value we

→ KE = 1/2×10 × 15²

→ KE = 5×225

→ KE = 1125 J

Therefore, the the work done to increases the velocity is 1125 Joules.

Answer 2

Answer:

Given :-

• A body of mass 10 kg is started from rest and it's velocity of 15 m/s.

To Find :-

• What is the work done to increases its velocity.

Formula Used :-

$\boxed{\bold{\small{✮\: Kinetic\: Energy\: =\: \dfrac{1}{2}mv²}}}$

Solution :-

Given :

• Mass (m) = 10 kg
• Velocity (v) = 15 m/s

According to the question by using the formula we get,

⇒ K.E = $\dfrac{1}{2}$ × (10) × (15)²

⇒ K.E.= 5 × 225

➥ K.E = 1125 J

$\therefore$ The work done to increases its velocity is 1125 J .

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