Which statement is true? a. speed is a scalar quantity and velocity is a vector quantity. b. speed and velocity are both scalar quantities. c. speed and velocity are both vector quantities. d. speed is a vector quantity and velocity is a scalar quantity. e. speed and velocity are neither a scalar quantity nor a vector quantity.

A.Speed is a scalar quantity and velocity is a vector quantity.

TRUE

Speed is the ratio of distance and time while velocity is the ratio of displacement and time

B.Speed and velocity are both scalar quantities.

FALSE

velocity is a vector quantity and it is ratio of displacement and time

C.Speed and velocity are both vector quantities.

FALSE

Speed is not a vector quantity but it is a scalar quantity

D.Speed is a vector quantity and velocity is a scalar quantity.

FALSE

Speed is scalar as it depends on distance while velocity is a vector which depends on displacement

E.Speed and velocity are neither a scalar quantity nor a vector quantity.

FALSE

Speed is scalar while velocity is vector

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.