4) A supermarket car park has 200 spaces. 10% of the spaces are for staff.
The other spaces are for disabled people, for parents and for other customers in the
ratio 1:2:7
Paul is going to paint a sign for each of the spaces for staff, for disabled people and
for parents.
He is not going to paint signs for the spaces for other customers.
Work out the total number of spaces Paul is going to paint a sign for.

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