Question

An object of mass 200 g moving with velocity 50 cm/s. What is its kinetic energy? 2 points A: 2.1 × 105 erg B: 2.0 × 105 erg C: 2.8 × 105 erg D: 2.5 × 105 erg

Answer 1

$\sf{\large{\underline{\underline{EXPLANATION:}}}}$

★Given,,

• Mass of the object,m=200g

• Velocity of the object,v=50cm/s

★To find ,,

• $\sf{K_{E}}$ of object.

★Using formula,,

$\mathtt{\boxed{K_{E}={\frac{1}{2}mv^{2}}}}$

$\sf{\implies{K_{E}={\frac{mv^{2}}{2}}}}$

$\sf{\implies{K_{E}={\frac{200\times{(50)^{2}}}{2}}}}$

$\sf{\implies{K_{E}=\frac{200\times{2500}}{2}}}$

$\sf{\implies{K_{E}={\cancel\dfrac{500000}{2}}}}$

$\sf{\implies{K_{E}={250000}}}$

$\sf{\implies{K_{E}=2.5\times{10^{5}}gcm/s}}$

★Therfore,,

Option D is the correct one.

$\rule{200}2$

†Hope it helps ❣️❣️❣️