A body of mass 3 kg is under a constant force which causes a displacement s in meters in it, given by the relation s = 
t 2 , where t is in seconds. Work done by the force in 2 seconds is:
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If a constant force is applied on the object causing a displacement in it, then it is said that work has been done on the body to displace it. Work done by the force
= Force cy × Displacement
or; kW = F × s... (i)
But from Newton’s 2nd law, we have
Force = Mass × Acceleration
i.e.,F = ma ... (ii)
Hence, from equation (i) and (ii), we get
W = mas = 
... (iii) 
Now, we have
s = 
= 
= 
= 
= 
Hence, eq. (iii) becomes
W = 
= 
= 
We have given
m = 3 kg, t = 2 s
W = 
= 
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