If a 42kg rolling object slows from 11.5 m/s to 3.33 m/s how much work does friction do?

•• 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?

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter