Question

A body of 800 gm mass is brought in motion with an acceleration of 2 m/s2 for
a time period of 4 second. Calculate work done in this case.​

Answer 1

Explanation:

First you need to change mass of the given body into kg because the SI unit of mass is kg.

So, 1 kg = 1000gms

therefore, 800 gm = 800 ÷ 1000

= 0.8 kg

Acceleration = 2m/s^2

Time = 4 secs

So, Work done = Force × Displacement

Now we need to find force and the formula for finding force is mass × acceleration = 0.8×2

= 1.6 N

Now we can find displacement using second equation of motion that is s= ut+1/2at^2

So, As the body must start from a point so initial velocity u= 0

Time= 4 secs, Acceleration= 2m/s^2

So, s= 0×4 + 1/2×2×4×4

Therefore, s = 16m

Now we have force as well as displacement

So, Work done = Force × Displacement

= ( 1.6 N× 16 m)

= 25.6 Nm

= 25.6 J.

I have mentioned each and every minor thing. So if you will get your solution and the correct then I will be grateful. and if you will find any mistake please inform