a steel girder weighting 700 lb is hoisted from gund level to the roof of a 70-ft building using a chain that weighs 4lb/running
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(1) Riley velocity relative to the water after she jumps is 1.7 m/s.
(2) The velocity of the canoe relative to the water is 5.02 m/s.
The given parameters;
- mass of Riley, m₁ = 62 kg
- mass of canoe, m₂ = 21 kg
- velocity of the Riley after jumping, v₁ = 1.7 m/s
(1) Since the lake is still, her velocity relative to the water after she jumps is 1.7 m/s.
(2) Apply the principle of conservation of linear momentum;
m₁v₁ = m₂v₂
62 x 1.7 = 21v₂
105.4 = 21v₂
Thus, after her leap, the velocity of the canoe relative to the water is 5.02 m/s.
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