A block of mass 1.4 kg is attached to a horizontal spring that has a force constant 900 N/m as shown in the figure below. The spring is compressed 2.0 cm and is then released from rest. x=0 || x=0 i (a) A constant friction force of 3.7 N retards the block's motion from the moment it is released. Using an energy approach, find the position x of the block at which its speed is a maximum. 1.566 X The response you submitted has the wrong sign. cm (b) Explore the effect of an increased friction force of 14.0 N. At what position of the block does its maximum speed occur in this situation? 0.444 X The response you submitted has the wrong sign. cm