Newton's cradle consists of an aligned row of identical elastic balls suspended by strings so they barely touch one another. when two balls are raised from one end and released, they strike the row and two balls pop out from the other end. if instead, one ball popped out with twice the speed of the two, this would violate

Initial momentum = 2 * m v

so if 1 ball popped out with 2 v momentum would be conserved

but the initial kinetic energy of the two balls is

1/2 m v^2 + 1/2 m v^2 = m v^2

But the kinetic energy of one ball with twice the speed would be

KE = 1/2 m (2 v)^2 = 2 m v^2 thus violating conservation of energy

yup its correct its: c) b b

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever