# A block is pushed up a frictionless ramp. Thehand pushes parallel to the incline with aconstant force of magnitude F,.The block ispushed through a vertical distance H. Theblock's initial speed (at the bottom of theramp) is vo. The ramp has an angle 0.НӨ

Question
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1.The work done by the hand on the block

is positive.
is negative.
is zero.
has a sign which cannot be determined from the given information.
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Step 1

Given:

block is moving on an inclined surface.

inclination angle = θ

direction of force = parallel to moving direction.

Step 2

the work done by force on any object is the dot product of force and it's displacement.

Step 3

according to formula the work done will be positive when angle between displacement and force is an acute angle.

according to question the displacement of block is,

...

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