There are free body diagrams in the picture, number (#). which of the diagram(s) shows an object at rest on a table? 2 and 3 3 only 2 and 4 2 only

Only #2 represents an object at rest on a table.

In #1, there is no normal force due to the table; the object is accelerating downward.

In #3, the vertical forces are not balanced; the object is accelerating downward.

In #4, neither the vertical nor the horizontal forces are balanced. The object is accelerating upwards AND to the right.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.