Question

Q3: The kinetic energy
a
of a
body of
mass 2kg is 25j. Find
its speed.​

Answer 1

$\huge\sf\red{Answer}$

Mass $\longrightarrow$ 2kg

Kinetic Energy $\longrightarrow$ 25j

Kinetic energy $\longrightarrow \frac{1}{2}mv²$

25 $\longrightarrow \frac{1}{2}2v²$

25 $\longrightarrow$ v²

v² $\longrightarrow$25

v $\longrightarrow$ √25

v $\longrightarrow$ 5

Velocity or speed of the body is 5m/s.

Answer 2

Answer:

• $5m/s$

Explanation:

$Given:-$

• Kinetic energy = 25J

• Mass of the body = 2kg

$ToFind:-$

• Speed of the body

$Solution :-$

$\underline{By\: using\: kinetic\: energy\: formula}$

$\boxed{K.E = \dfrac{1}{2} mv^2}$

Where,

• m = mass

• v = velocity

• K.E = Kinetic energy

$\implies \:\:25 = \dfrac{1}{2} \times 2 \times {v}^{2}$

$\implies \:\: 25 = {v}^{2}$

$\implies \:\: v = \sqrt{25}$

$\implies \:\: v = 5$

$\therefore$ Speed of the body is 5m/s