please answer question's. 12 and 13
PLzzz answer it fastly
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13 ----> In case Acceleration is -ve but small in comparison to Initial velocity
mspkkavya:
is it yes or no
give example
also answer 12th
Yes, An example is when Initial Velocity is 20m/s and acceleration is -2m/s^2
then 12th
I'm a bit confused with 12th
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12) Velocity is constant. It means that both magnitude and direction are same.
So, over any interval of time, average velocity will be same as instantaneous velocity, as velocity is not changing at all.
Eg. Suppose a vehicle is moving in a straight line with constant velocity. Consider any time interval or any instant. It's velocity is same.
So, the average velocity over any time interval cannot differ from instantaneous velocity at any instant.
13) Acceleration is constant. That means both it's direction and magnitude is same. But here, the answer is yes. The direction of velocity can reverse even though acceleration is constant. For example, suppose the velocity is initially +10 m/s, and acceleration is -1 m/s^2. Here acceleration is in opposite direction to velocity. The velocity will keep decreasing, then become zero and will finally be reversed.
So, over any interval of time, average velocity will be same as instantaneous velocity, as velocity is not changing at all.
Eg. Suppose a vehicle is moving in a straight line with constant velocity. Consider any time interval or any instant. It's velocity is same.
So, the average velocity over any time interval cannot differ from instantaneous velocity at any instant.
13) Acceleration is constant. That means both it's direction and magnitude is same. But here, the answer is yes. The direction of velocity can reverse even though acceleration is constant. For example, suppose the velocity is initially +10 m/s, and acceleration is -1 m/s^2. Here acceleration is in opposite direction to velocity. The velocity will keep decreasing, then become zero and will finally be reversed.
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