The Engineering News Record Formula, \({Q_a} = \frac{{Wh}}{{6\left( {s\; + \;0.25} \right)}},\) is used for the case of

1. Drop hammer

2. Single-acting hammer

3. Double-acting hammer

Which of the above is/are correct?

1
1 only
2
2 only 
3
3 only
4
1, 2 and 3

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