Three students are moving a total of 90-N cartons of books from the floor to a platform with a height of 2 m. Student (A) moves 11 cartons in 6 minutes. Student (B) moves 11 cartons in 5 minutes. While Student C moves 11 cartons in 4 minutes. Which student does more work on her cartons?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?