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Given:

Length = 2 × width

Perimeter = 42 cm

To find:

Length and width of the rectangle

Solution:

Length = 2 × width

Perimeter =

     ()

Divide by 6 on both sides.

w = 7

Substitute w = 7 in length.

l = 14

The length of the rectangle is 14 cm.

The width of the rectangle is 7 cm.

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v