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Motion in Straight Line

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation , where t is in s. Work done by the force in 2 s is:

C.

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 x Displacement
or          W = F x s                            ...(i)
But from Newton's 2nd law, we have
Force  =  Mass x Acceleration
i.e.,       F = ma                                ...(ii)
Hence, from Eqs. (i) and (ii), we get

Hence, Eq (ii) becomes

We have given

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 x Displacement
or          W = F x s                            ...(i)
But from Newton's 2nd law, we have
Force  =  Mass x Acceleration
i.e.,       F = ma                                ...(ii)
Hence, from Eqs. (i) and (ii), we get

Hence, Eq (ii) becomes

We have given

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What is motion?

When an object changes it's position with time, with respect to it's surroundings, the object is said to be in motion.
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