Answer:
6.86 meters
Explanation:
Let the compression of the string be represented by x, and the height of projection of the toy rocket be represented by h.
So that;
x = 9 cm = 0.09 m
In its rest position (i.e before the launch), the spring has a stored potential energy which is given as;
PE = 
K
= x 830 x 
= 415 x 0.0081
= 3.3615
The potential energy in the string = 3.36 Joules
Also,
PE = mgh
where: m is the mass, g is the gravitational force and h the height.
m = 50 g = 0.05 kg, g = 9.8 m
Thus,
PE = 0.05 x 9.8 x h
3.3615 = 0.05 x 9.8 x h
3.3615 = 0.49h
⇒ h = 
= 6.8602
The height of the toy rocket would be 6.86 meters.
Answer:
9/25
Explanation:
Distance covered in the first 5 seconds:
Δx = v₀ t + ½ at²
Δx₀₋₅ = (0) (5) + ½ a (5)²
Δx₀₋₅ = 25a/2
Distance covered in the first 4 seconds:
Δx = v₀ t + ½ at²
Δx₀₋₄ = (0) (4) + ½ a (4)²
Δx₀₋₄ = 8a
So the distance covered during the 5th second is:
Δx₅ = 25a/2 − 8a
Δx₅ = 9a/2
So the ratio of the distance covered during the 5th second to the distance covered in the first 5 seconds is:
Δx₅ / Δx₀₋₅
(9a/2) / (25a/2)
9/25
This indicates that they are moving away from each other, meaning that they form a divergent plate boundary, between the two continental plates, the Eurasian Plate moving eastward, and the North American Plate moving west, this forms the Mid Atlantic Ridge.<span>
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Answer:
Explanation:
the momentum of a body is defined as the product of mass of body and the velocity f the body.
P = m x v
Where, m is the mass and v be the velocity of the body.
it is a vector quantity and its unit is newton second.
When the velocity of the object is zero, the momentum is also zero.
Newtons' first law states that the body is at rest or in motion , it remains at rest or in motion until and unless an external force is not applied on the body.
So, When a body is at rest it remains at rest.
I took this test before, aren't there answer choices? :)
