A 60 kg body is pushed horizontally with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body is (g = 10m/s2) :
(1) 6 m/s2
(2) 4.9 m/s2
(3) 3.92 m/s2
(4) 1 m/s2
