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
Answer:
4 m/s south
Explanation:
This is a pretty easy one.
Assume that the car has a reference point ragged x
We also know that the car starts moving at a point 10 m North of X. It moves steadily at a uniform velocity and ended at a position 10 m south of X.
If x is the reference point, we can infer that the car moves a total distance of, 10 m + 10 m.
Thus, the total distance moved by the car is 20 m.
It is also stated that it achieves that distance in 5 seconds.
Velocity is defined as the ratio of distance with respect to the tome taken, i.e V = d/t
Then, the velocity is
V = 20 / 5 = 4 m/s
Considering the fact that the car left and moved towards the south. We can say that it moved 4 m/s South.
Answer: A
After rocks are eroded the particles turn into a sedimentary rock.
B, the surface of a flat table.
