Ablock slides down a rough ramp with a 30-degree incline as shown. which diagram represents the forces acting on the block?
image for option 1
image for option 2
image for option 3
image for option 4

Image for option 4

Explanation:

The fourth option is correct because there are three forces acting on the block:

which is the Friction force and acts against the movement of the block

the Normal Force, which is perpendicular (normal) to the surface of the rough ramp

the Weight of the block, which is the force due gravity acceleration and has an x-component and an y-component.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

this could be newton#'s law of cooling. the cooling curve is exponential