Activity B (continued from previous page)
7. Predict: Work is done whenever a force causes an object to move, increasing the object's
mechanical energy, which is the sum of its potential and kinetic energies. As you have
learned, an inclined plane has a mechanical advantage because it makes it easier to lift an
object, but do you think an inclined plane helps you to do less work? Explain your answer.

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

snell's law

refractve index = sin incidence / sin refraction