Question

a player kicks A ball of mass 0.5 kg placed at at the centre of a field the ball leaves with the speed of 8 metre per second the kinetic energy of ball​

Answer 1

Provided that:

• Mass of ball = 0.5 kg
• Velocity = 8 m/s

To calculate:

• Kinetic energy

Solution:

• Kinetic energy = 16 J

Using concept:

• Kinetic energy formula

Using formula:

• ${\small{\underline{\boxed{\sf{E_k \: = \dfrac{1}{2} \: mv^2}}}}}$

Where, E_k denotes kinetic energy, m denotes mass of the object and v denotes the velocity.

Required solution:

$:\implies \sf E_k \: = \dfrac{1}{2} \: mv^2 \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 0.5(8)^{2} \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 0.5 \times 8 \times 8 \\ \\ :\implies \sf E_k \: = \dfrac{1}{2} \times 0.5 \times 64 \\ \\ :\implies \sf E_k \: = \dfrac{1}{\cancel{{2}}} \times 0.5 \times \cancel{64} \\ \\ :\implies \sf E_k \: = 1 \times 0.5 \times 32 \\ \\ :\implies \sf E_k \: = 16 \: J \\ \\ :\implies \sf Kinetic \: energy \: = 16 \: Joules$

Answer 2

Answer:-

• Mass=0.5kg =m
• Velocity=v=8m/s

We know that

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

➡️ Kinetic Energy=1/2×0.5×8²

➜Kinetic Energy=1/2×0.5×64

➜Kinetic energy=0.5×32

➜Kinetic Energy=32/2

➜Kinetic energy=16Joules