Good evening,

can you help me with those questions

1.

Work and Kinetic Energy Activity 1: Determining Work and Change in Kinetic Energy With the people next to you, determine in each of the cases the different forces, sign (+ , -, or 0) of the work done by the forces, and the sign (+, - , or 0) in the change in kinetic energy. Example: An elevator moves up at a constant speed. Forces are gravity and tension. W. = -, WT = +, AK = 0. 1. A descending elevator brakes to a halt. 2. A box slides up a frictionless slope. 3. A rope pulls a box to the left across a frictionless floor. 4. A car turns a corner at constant speed.Activity 2: Discussions With the people next to you, discuss the following questions and record your collective answers. 1. A nonzero net force acts on an object. Is it possible for any of the following quantities to be constant: (a) the object's speed, (b) the objects velocity, (c) the object's kinetic energy? 2. Why does going up the stairs quickly feel more difficult than going up the stairs at a steady pace, if the same amount of work is done?Activity 3: Problems With the people next to you, solve the following problems. A 0.100 kg box is attached to the end of a spring that is anchored to the wall on the left. The spring is initially unstretched. The box is given an initial velocity of 1.5 m/s to the right. How far along the horizontal surface will the box move if the spring constant of the spring is 20.0 N/m and the coefficient of kinetic friction is 0.47? to