A wooden block of mass m1 kg accelerates at 10 ms-2 when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 ms-2 when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about:
1
6.67 ms-2
2
1.67 ms-2
3
5.67 ms-2
4
4.67 ms-2