Question

please give all Answer

Answer 1

Q12) by the above attachment we get that acceleration of bus is -1.11 m/s²


Q13) Q 14) Q 15)

v = u + at

Let us begin with the first equation, v=u+at. This equation only talks about the acceleration, time, the initial and the final velocity. Let us assume a body that has a mass “m” and initial velocity “u”. Let after time “t” its final velocity becomes “v” due to uniform acceleration “a”. Now we know that:
Acceleration = Change in velocity/Time Taken
Therefore,  Acceleration = (Final Velocity-Initial Velocity) / Time Taken
Hence, a = v-u /t or at = v-u
Therefore, we have: v = u + at

v² = u² + 2as

We have, v = u + at. Hence, we can write t = (v-u)/a
Also, we know that, Distance = average velocity × Time
Therefore, for constant acceleration we can write: Average velocity = (final velocity + initial velocty)/2 = (v+u)/2
Hence, Distance (s) = [(v+u)/2]  × [(v-u)/a]
or  s = (v² – u²)/2a
or 2as = v² – u²
or v² = u² + 2as

s = ut + ½at²

Let the distance be “s”. We know that
Distance = Average velocity × Time. Also, Average velocity = (u+v)/2
Therefore, Distance (s) = (u+v)/2 × t
Also, from v = u + at, we have:
s = (u+u+at)/2 × t = (2u+at)/2 × t
s = (2ut+at²)/2 = 2ut/2 + at²/2
or s = ut +½ at²


Q 16

Uniform circular motion can be described as themotion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle.


Q 17)
Centripetal force is responsible for acceleration in a uniform circular motion.

Q18)


No, when a body is under uniform acceleration doesn't mean that it is under uniform motion. Uniform acceleration means, that the velocity of body is changing with a constant rate. On the other hand, uniform motion means that the body is in motion with constant velocity.

Q 19)