Answer:
0.30 m/s²
Explanation:
Given:
v₀ = 0.2 m/s
v = 1.6 m/s
t = 4.7 s
Find: a
a = (v − v₀) / t
a = (1.6 m/s − 0.2 m/s) / 4.7 s
a = 0.30 m/s²
Answer:
Explanation:
We shall apply law of conservation of mechanical energy for projectile being thrown .
Total energy on the surface = total energy at height h required
a ) At height h , velocity = .351 x ( 2 GM/R x h )



h = .14 R
b )


h = .54 R
c ) least initial mechanical energy required at launch if the projectile is to escape Earth
= GMm / R + 1/2 m (2GM/R)
= 0
Answer:


Explanation:
We can start from the known formula:

so we can write, since we want the initial velocity in terms of the ball's displacement, its acceleration in the vertical direction, and the elapsed time:

and for our values we have:

Taking into account the definition of density, the volume of B is larger compared to the volume of A.
<h3>Definition of density</h3>
Density is defined as the property that matter has to compress into a given space and is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
<h3>Volume of each object</h3>
In this case, you know that:
- Density of object A= 5 g/mL
- Density of object B= 10 g/mL
- Mass of object A= 225 g
- Mass of object B= 225 g
Replacing in the definition of density:
- Object A: 5 g/mL= 225 g÷ volume
- Object B: 10 g/mL= 225 g÷ volume
Solving:
- Object A: 5 g/mL×volume= 225 g → volume= 225 g÷ 5 g/mL → volume= 45 mL
- Object B: 10 g/mL×volume= 225 g → volume= 225 g÷ 10 g/mL → volume= 22.5 mL
In summary, the volume of B is larger compared to the volume of A.
Learn more about density:
brainly.com/question/952755
brainly.com/question/1462554
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Answer:
Average speed, 
Explanation:
Given:
- Initial speed, u=40 cm/s
- final speed , v=20 cm/s
- Time taken, t=5 s
<u>First case</u>
Using equation of motion we have

Now using,

now putting the value of a in first equation we get

<u>Second case</u>
Acceleration
Time taken 
using equation of motion in one Dimension we have

Average speed is equal to total distance travelled per unit total time taken
