The masses of blocks a and b in fig. p5.126 are 20.0 kg and 10.0 kg, respectively. the blocks are initially at rest on the floor and are connected by a massless string passing over a massless and frictionless pulley. an upward force is applied to the pulley. find the accelerations of block a and of block b when f is (a) 124 n; (b) 294 n; (c) 424 n.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

maria has a savings account that is earning simple interest. if she started with $200 in the account and has earned a total of $8 in interest in two years, what is the rate of the account? use the formula  .

12.50.080.001250.02

'b ' is the correct conclusion.