Question

physics selection paper, solve it,,cls 10

Answer 1

Answer :

The change in kinetic energy is 4 Joule.

Step-by-step explanation :

Given,

Mass, $m=0.5$ kg

Initial velocity, $u=5$ m/s

Final velocity, $v=3$ m/s

To find - Change in kinetic energy

By using the formula -

Change in kinetic energy -

⇒ $\sf\frac{1}{2}mv^{2}-\frac{1}{2}mu^{2}$

⇒ $\sf\frac{1}{2}\times 0.5\times 3^{2}-\frac{1}{2}\times 0.5\times 5^{2}$

⇒ $\sf{2.25-6.25}$

⇒ $\sf{-4}$ Joule

Answer 2

Answer -

Here,

m = 0.5 kg, u = 5 m/s, v = 3 m/s

Change in kinetic energy -

》 1/2 × m × v^2 - 1/2 × m × u^2

》1/2 × 0.5 × 3^2 - 1/2 × 0.5 × 5^2

》2.25 - 6.25

》-4 J