An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average speed of the object
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Ответ:
v = 0.5 m/s.
Explanation:
Total distance, d = 20 m + 20 m = 40 m
Total time taken, t = 30 s + 50 s = 80 s
The average speed of an object is the total distance divided by time taken. So,
So, the average speed of the object is 0.5 m/s.
Ответ:
At highest point of the path the acceleration is perpendicular to velocity direction so there is no change in speed at this moment.
Explanation:
When an object is thrown at an angle of 30 degree with the horizontal with some initial speed
then we will have
now its acceleration due to gravity is given as
with the help of kinematics we can say that its velocity after any time "t" is given as
now when it will reach to its highest point then its velocity in y direction becomes zero
now since final velocity is along x direction only at the highest point while its acceleration at that point is due to gravity so at that moment there is no change in speed.