Question

1. A drop hammer of mass 120 kg falls 2.5 m onto a pile of mass 250 kg and drives it 70 mm into the ground. Calculate:

1. The velocity with which the hammer strikes the pile (use the conservation of energy principle)

2. The velocity immediately after the impact(use the conservation of momentum principle, assuming the hammer does not rebound on impact)

3. The average ground resistance (use work-energy method)

Answer 1

Soluhon- ahon of energy 29 cnange n chang in 25mPoha) Enry ineEndy 25u k 27 Law of Cons eNoP of moment Hamme dde not sebounds m eans Hommex pile moven togeth ca with velouity v. V2.2 m/sec Gsound Resic change in kmehc Energy CN os k done F- 1361.83 N ond Scanned with CamScanner ICS Resistance.