if acceleration of particle is zero form t= 0 to t =5 then....
a. velocity must be zero
b. speed must be zero
c. velocity Descreaese
d. velocity in constant in the interval
Answers
Answer:
Explanation:
The figure is attached
At t=0, the velocity vector can be written as
At t=0, the acceleration vector can be written as
....... (1)
................. (2)
(1) Let after time t the speed is again 8 m/s
The velocity in x direction after time t
By first equation of motion
Similarly, velocity in y direction after time t
Therefore, the speed will be v = 8
Therefore, after time t=0, the next the speed will be 8 m/s after 4 seconds.
(2)The acceleration is constant therefore, its vector will be what is computed in eq (2)
The velocity vector after time t is given by
If acceleration vector and velocity vectors are perpendicular
Then
seconds
Therefore, after 2 seconds, acceleration and velocity vector of th particle are mutually perpendicular
(3) From t=0 to t=4, displacement in x direction
m
Similarly, displacement in y direction
Thus, the magnitude of displacement
Therefore, the magnitude of displacement of the particle in time interval t=0 to t=4 is 16√3 m
Hope this answer is helpful.
Answer:
d is the correct option
Explanation:
when acceleration is zero velocity will be constant