Answer: 79.35 N
Explanation: according to the impulse momentum theorem,
Impulse = change in momentum
Where impulse = force × time and change in momentum = m ( v - u).
The object was initially at rest, hence it initial velocity is zero.
To get the final velocity, we use the formulae below
v² = u² + 2gh
Where h = height of the cliff = 17m
v² = 2 × 9.8 × 17
v² = 333.2
v = √333.2
v = 18.25 m/s
At t = 0.46s and v = 18.25 m/s, we can get the average force of impact
F×0.46 = 2 (18.25 - 0)
F × 0.46 = 2 (18.25)
F × 0.46 = 36.5
F = 36.5 /0.46 = 79.35 N
