Asmall object is sliding along a level surface with negligible friction, and has mass m, and constant speed v_0, when it collides with a brick resting on the surface. if the object recoils backward at (v_0)/3, and is in contact with the brick for time delta t, what average force did the brick exert on the object? assume the object is moving along x-direction.

a. f_net = 0
b. f_net= )/delta t)
c. f_net = )/(3delta t))
d. f_net = )/ delta t)
e. f_net = )/(2delta t))
f. f_net = )/(3delta t))

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

Why do electron microscopes have higher resolving power than light microscopes?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)