A ball moves on a frictionless inclined table without slipping. The work done by the table surface on the ball is ____________.

(a)

positive

(b)

negative

(c)

zero

(d)

none

A force\(\overrightarrow { F } =3\hat { i } +c\hat { j } +2\hat { k } \) acting on a particle causes a displacement \(\overrightarrow { S } =(2\hat { i } -3\hat { j } +4\hat { k } )\) in its own direction. If the work done is 8J, then the value of c is ______________.

(a)

0

(b)

6

(c)

2

(d)

1

A body is falling from a height h. After it has fallen a height \(\frac{h}{2}\) it will possess _______________

(a)

only Potential Energy

(b)

only Kinetic Energy

(c)

half potential and half kinetic energy

(d)

more kinetic and less potential energy

Water stored in a dam possesses _______________.

(a)

no energy

(b)

electrical energy

(c)

kinetic energy

(d)

potential energy

Which one of the following is not the unit of energy?

(a)

joule

(b)

Nm

(c)

kW

(d)

kWh