Question

An object of mass 5 kg is moving with a velocity of 10m/s then calculate the value of work done on the object ?​

Answer 1

AnswEr :

• Mass (m) = 5kg
• Velocity (v) = 10 m/s

By Work energy theorem, we know that the work done in stored in the form of Kinetic Energy as well. So, we can conclude that :

$\\ \longrightarrow \tt{Work\ Done\ =\ Kinetic\ Energy} \\ \\ \\ \longrightarrow \tt{Work\ Done\ =\ \dfrac{1}{2} mv^2} \\ \\ \\ \longrightarrow \tt{Work\ Done\ =\ \dfrac{1}{2}\ \times\ 5\ \times\ (10)^2} \\ \\ \\ \longrightarrow \tt{Work\ Done\ =\ \dfrac{1}{\cancel{2}}\ \times\ 5\ \times\ \cancel{100}} \\ \\ \\ \longrightarrow \tt{Work\ Done\ =\ 5\ \times\ 50} \\ \\ \\ \large \longrightarrow {\underline{\boxed{\mathfrak{Work\ Done\ =\ 250}\ J}}}$

Answer 2

Answer:

By using the formula W = 1/2 mv² (as energy = work done is taken)

So, W=250 J ( by putting the value of m=5kg and v²=(10)² )