A boat is traveling at a velocity of 20 m/s North. The boat speeds up and is then traveling at 28 m/s North. If the boat took 4.5 seconds to speed up, what is the acceleration of the boat?

Properties seen when one one substance changes to another are known as properties

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)

What is the answer to these problems 30 pt