4.) it was once recorded that a jaguar left skid marks which were +300 m in length.
assuming that the jaguar skidded to a stop with a uniform acceleration of -4.00 m/s,
determine the velocity of the jaguar before it began to skid.
a.) 49 m/s
b.) 60 m/s2
c.) 10 m/s
d.) 49 m/s?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Most of the volume of an atom is occupied by the

A50 kg student climbs 3 m to the top of a set of stairs. calculate the change in the student’s gravitational potential energy from the bottom to the top of the stairs. show your calculations and include units in your answer. how much total work does the student do while climbing the stairs? show your calculations or explain your reasoning. include units in your answer. it takes the student 30 s to climb to the top of the stairs. what is the average power generated by the student climbing the stairs? show your calculations and include units in your answer. the next day the student carries a 10 kg backpack up the same stairs and again takes 30 s to reach the top of the stairs. is the average power you calculated in part (c) greater than, less than, or equal to the average power the student generated the next day? explain your answer.