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))

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction