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The potential energy U in joule of a par...

The potential energy `U` in joule of a particle of mass `1 kg` moving in `x-y` plane obeys the law`U = 3x + 4y`, where `(x,y)` are the co-ordinates of the particle in metre. If the particle is at rest at `(6,4)` at time `t = 0` then :

A

the particle has constant acceleration

B

the particle has zero acceleration

C

the speed of the particle when it crosses y-axis is `10 m//s`

D

co-ordinate of particle at `t = 1` sec is (4.5, 2)

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A, C, D
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