Answer:
After 11.62 sec car will axceed the speed limit
Explanation:
We have given constant acceleration ![a=2.5m/sec^2](https://tex.z-dn.net/?f=a%3D2.5m%2Fsec%5E2)
As the car starts from rest so its initial velocity u = 0 m/sec
Final velocity v = 65 miles/hr
We know that 1 mile = 1609 meters
And 1 hour = 3600 sec
So ![65miles/hour=\frac{65\times 1609m}{3600sec}=29.051m/sec](https://tex.z-dn.net/?f=65miles%2Fhour%3D%5Cfrac%7B65%5Ctimes%201609m%7D%7B3600sec%7D%3D29.051m%2Fsec)
From first equation of motion v = u+at
So ![29.051=0+2.5\times t](https://tex.z-dn.net/?f=29.051%3D0%2B2.5%5Ctimes%20t)
t = 11.62 sec
So after 11.62 sec car will axceed the speed limit
Mass and weight are different. Mass is the measurement of how much matter an object has, while weight deals with the pull of gravity. For example, an astronaut floating in space is weightless, due to the limited influence of gravity. But he will still have mass, that is because mass and weight are different :)
Answer:
Yes a body moving with a constant speed has an acceleration. When an object travel in a circle with a constant speed it's direction keeps changing as a result velocity changing but it works at the centre of the circle therefore acceleration acts at the centre of the circle.
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- Velocity is the distance travelled by an object in a unti time with a specific direction . It is a vector quantity.
- Velocity = Displacement/time
- Ways in which velocity can be change -
- By changing speed
- By changing Direction
- Acceleration is the rate. change of velocity
- Acc = V - U /t
- It is also a vector quantity
- Si unit of velocity = M/S
- Si unit of acceleration = M/S^2
- Average velocity = V + u /2
- U = Initial velocity
- V = Final velocity
- acc = acceleration
- The initial velocity of an object at rest is 0
- The final veloctiy of an object after rest is 0