To practice Problem-Solving Strategy 6.1 Work and Kinetic Energy. Your cat Goldie (mass 8.50 kg ) is trying to make it to the top of a frictionless ramp 39.930 m long and inclined 27.0 ∘ above the horizontal. Since Goldie can’t get any traction on the ramp, you push her up the entire length of the ramp by exerting a constant 37.40 N force parallel to the ramp (there is a set of stairs alongside the frictionless ramp on which you can walk). If Goldie is moving at 2.000 m/s at the bottom of the ramp (assume she has gotten a running start), what is her speed when she reaches the top of the incline?

Explanation:

the forces parallel to the ramp are:

where F is the force exerted by the person, Mg is the weight of the cat, theta is the angle of the ramp, m is the mass of the cat and a is the acceleration.

By replacing we can obtain the acceleration of the cat:

Then, the cat is slowing down while it is going up the ramp.

Now, we can compute the final speed by using the following formula:

!!! the cat has a negative acceleration, hence, the force exerted by the person is not enough to move the cat upward.

it is neccesary to review the values of the exercise

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me