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The average speed of the car is 20 m/s. This is calculated by dividing the distance travelled (2 km = 2000 m) by the time taken (100 s).

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1y ago

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Does a sound wave need a medium?

Yes. The speed of sound in a medium depend on the (sq root of the elastic modulus/ the density).The speed of sound in a few metals are :-Beryllium with a speed of about 13 km/sec. (the highest)Potassium has a velocity of sound of about 2km/sec. - (soft metal)Lithium, has a sound velocity of about 6 km/sec.( the lightest metal)Copper a fairly dense but soft metal has a sound velocity of about 3.8km/sec.Osmium about 4.9 km/sec. (The densest metal)Magnesium about 4.9 km/sec. a light metal, but stiff.


How many nanoseconds does it take light to travel 2.00 km in vacuum?

One 'rule of thumb' that many of us oldtime engineers carry in our decomposing mental toolboxes is: 1 foot = 1 nanosecond. Since you asked, I'll calculate it now, and see how close it is: Speed of light in vacuum = 299,792,458 meters per second. Use 1 meter = 3.28084 feet Speed of light = 983571000 feet per second. Speed of light = 0.98357+ foot per nanosecond "1 foot = 1 nanosecond" is within 1.65 percent of being accurate. 2.5 feet (in vacuum) takes 2.5418 nanoseconds (rounded)


What happens to velocity if you double kinetic energy?

The square of 2 is 4. So, if the velocity doubles, the energy increases by a factor of 4.The square of 2 is 4. So, if the velocity doubles, the energy increases by a factor of 4.The square of 2 is 4. So, if the velocity doubles, the energy increases by a factor of 4.The square of 2 is 4. So, if the velocity doubles, the energy increases by a factor of 4.


When a person moves a distance of 3km towards East then 2km towards North and 3.5km towards East find a distance covered by person and displacement?

The total distance covered by the person is ( 3 km + 2 km + 3.5 km = 8.5 km ). The displacement of the person is the straight-line distance from the initial point to the final point, which can be calculated using Pythagoras' theorem as ( \sqrt{(3 km)^2 + (2 km + 3.5 km)^2} \approx 5.7 km ).


How far will a .243 caliber rifle bullet travel?

The velocity of a bullet is dependent on many factors. The amount and type of propellant affect velocity, as does the barrel length. The Springfield 30-06 with a 180 grain bullet can have a velocity of 820 meters per second based on a 60 centimeter barrel - again dependent on powder charge and type.