1.

A constant force acts on a body of mass m at rest fort second and then ceases to act. In next 't’ second the body travels a distance 'x'. Magnitude of force is :

Answer»

`(mx)/(t^(2))`
`(mx)/(t)`
`mxt`
`mxt^(2)`

Solution :For next r. sec the velocity is UNIFORM as force is absent
`upsilon=(x)/(t)` Now `upsilon = U + at or (x)/(t) = 0 + at`
or `a=(x)(t^(2))` and force `F=m.a=(mx)/(t^(2))`
(a) is the CHOICE.


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