4. Two blocks made from different material lay side by side on a flat plane. Block 1 (5 kg) has a kinetic coefficient of friction (µk = 0.6). Block 2 (2 kg) has no friction with the ground. Both are given an initial velocity of 10 m/s. Find the distance between the blocks after 5 seconds. (a) What is the magnitude of the tension force in the string? (b) What is the magnitude of the acceleration of the system?

Fig: 1

Fig: 2

Fig: 3