Two rectangular blocks are made from different materials. Four separate methods are proposed for comparing the two masses. 1. Compare the accelerations as they fall freely. 2. Compare the values of their lengths × breadths × heights. 3. Suspend each block, one after the other, from the same spring. Compare the extensions. 4. Put one block in the right-hand pan of a beam balance and the other block in the left-hand pan. Which methods provide a comparison of the two masses?
- A1, 2 and 3
- B1 and 2 only
- C3 and 4 only
- D4 only