$.$ A small charged block with a mass m $=60$ grams is initially at rest on an insulated

And frictionless inclined plane $(\backslash$theta $=40\backslash$deg $).$

There is a uniform electric field of $3000$ N$/$C

pointing to the left that acts on the block.

The block is moving at $0\mathrm{.}320$ m$/$s after it has

travelled $0\mathrm{.}800$ meters up the incline.

Determine the magnitude and sign of the charge

on the block.