Question

A bullet of mass 60 g has its K.E equal to 300 J. Find the speed of the bullet. *

Answer 1

Given:-

• Mass of bullet,m = 60 g

• Kinetic energy,K.E. = 300 J

To be calculated:-

Calculate the velocity ( v ) of the bullet .

Formula used:-

Kinetic energy = 1/2 × m × v²

Solution:-

We will convert 60 grams into kilograms,

60 g

= 60/1000

= 0.06 kg

Now,

Kinetic energy = 300 J [ Given ]

⇒ 1/2 × m × v² = 300 J

★ Substituting the values in the above formula,we get:

⇒ 1/2 × 0.06 × v² = 300

⇒ 0.03 × v² = 300

⇒ v² = 300/0.03

⇒ v² = 30000/3

⇒ v² = 10000

⇒ v = √10000

⇒ v = 100 m/s

Thus,the velocity of bullet is 100 m/s.

Answer 2

⭐GIVEN⭐

▪ mass of bullet(m)➡0.06kg

▪ Kinetic energy (K.E)➡300j

⭐WHAT'S TO FIND?⭐

▪Speed(v)➡?

⭐SOLUTION⭐

BY APPLYING KINETIC ENERGY EQUATION

1/2(mv²)➡K.E

1/2(0.06*v²)➡300

0.06*v²➡600

v²➡600/0.06

v²➡10000

v➡100m/s

⭐YOUR ANSWER⭐

▪100m/s(velocity)