The acceleration is .
Explanation:
The acceleration of an object is given by:
where
v is the final velocity
u is the initial velocity
t is the time taken for the velocity to change from u to v
For the bike in this problem, we have:
is the initial velocity
v = 0 is the final velocity (the bike comes to a stop)
t = 0.8 s is the time interval
Substituting, we find the acceleration:
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Answer:
b) Vectors A and B are in the same direction.
Explanation:
To understand this problem we will say that vector A has a magnitude of 5 units and vector B a magnitude of 3 units. In the subtraction of vectors the initial parts of vectors always bind together. And the vector resulting from the subtraction is traced from the end of the second vector (B) to the end of the first vector (A).
The length of the resultant vector will be 5 - 3 = 2
In the attached image, we analyze case a), b), and d)
For a)
As we can see in the attached image the resultant vector has a length of 8 units.
For d)
As we can see in the attached image the resultant vector has a length of 5.83 units.
For b)
The resultant vector has a length of 2 units.
Therefore the case given in b) is true
Answer:
Average speed,
Explanation:
Given:
<u>First case</u>
Using equation of motion we have
Now using,
now putting the value of a in first equation we get
<u>Second case</u>
Acceleration
Time taken
using equation of motion in one Dimension we have
Average speed is equal to total distance travelled per unit total time taken