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3 years ago

Calculate the speed of a car that travels 355km in 15 hours , a good answer please

Physics

2 answers:

Ludmilka [50]3 years ago

8 0

Answer:

23.67 km / hr

Explanation:

car travels 355 km (d)

duration = 15 hrs (t)

average speed formula = v = d / t

v = 355 km / 15 hr

v = 23.67 km / hr

Zigmanuir [339]3 years ago

8 0

Explanation:

Hello, there!!!

Here, your question is asking about the speed and the given are:

distance (s)= 355km

time (t) = 15hrs.

speed (v)=?

now, 

we have the formula:

 

v= s/t

or, v = 335km /15 hrs.

Therefore, the speed of car was 23.67km/hr.

Hope it helps..

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If two objects collid and one is initially at rest, is it possible for both to be at rest after the collision?

Ludmilka [50]

Answer:

Is it NOT possible for both particles to be at rest after the collision

Explanation:

Law Of Conservation Of Linear Momentum

The total linear momentum of a system of particles is conserved regardless of their internal interactions while no external force is applied to the system. If $m_1$ and $m_2$ are the masses of two particles, and only one of them is at rest, there is a non-zero total linear momentum, i.e.

$P_1=m_1v_1+m_2v_2$

if at least one of the speeds is not zero, the total initial linear momentum is not zero.

If after the collision, both particles remain at rest, both speeds will be zero and the total linear momentum won't be conserved.

So, is it NOT possible for both particles to be at rest after the collision

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denpristay [2]

Answer:

5000 kg/m^3

Explanation:

Here. we are asked to calculate the density of the rock specimen.

we proceed as follows;

mass of water displaced is calculated by finding the difference between the actual and apparent masses

This has a value of 0.45kg - 0.36kg = 0.09kg

The rock and water that is displaced have exactly the same volume and thus their densities is the same. This makes the ratio of their masses to be the same

Ratio of masses is

0.45 / 0.09 = 5.0

Here we can see that the mass of the rock is five times the mass of the water so it must be five times denser

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Explanation:

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