Can someone explain and help me

Which quantities are scalars? choose all that apply a. distance b. speed c. acceleration d. velocity

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface