A traveller pulls his wheeled suitcase by applying a force of 40N along the handle that makes an angle of 60∘ above the horizontal. The suitcase moves 10m horizontally along a smooth floor. What are the signs of the work done by (i) the vertical component of the pulling force and (ii) the normal reaction of the floor on the suitcase?
a) Vertical component: positive; Normal reaction: zero
b) Vertical component: negative; Normal reaction: negative
c) Vertical component: zero; Normal reaction: zero
d) Vertical component: zero; Normal reaction: negative