Question

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have masses of 8 and 35 kg. If A and B are 3.0 and 1.0 m, respectively, above the ground, determine the speed of **(a)** the lighter box and **(b)** the heavier box when each reaches B. **(c)** What is the ratio of the kinetic energy of the heavier box to that of the lighter box at B?

Step 1

The mass of the lighter box = 8 kg.

The mass of the heavier box = 35 kg.

The distance between point A and B =3 m-1 m

=2 m.

(a) As the box slides from point A to point B the potential energy changes to kinetic energy. According to conservation of energy the kinetic energy will be equal to potential energy.

Consider equation (I), and obtain an expression for speed of the lighter box.

Step 2

Substitute the corresponding values.

Step 3

(b) Since equation (II) is independent of mass, ...

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