Respuesta :
(a) Is the velocity ever zero?
Answer:
NO, it will never become zero
Explanation:
Since velocity is constant always along x direction as there is no acceleration in that direction so its velocity in x direction always remains same and net velocity is never zero during motion.
(b) When is the velocity a minimum? A maximum?
Answer:
Velocity is minimum when it will reach the maximum height.
Velocity is maximum when it will reach the ground back or initial velocity is maximum
Explanation:
Since we know that y component of velocity will become zero at its maximum height
So here we can say that velocity is minimum when it will reach the top point of its path.
Since during its upward motion it is moving against gravity so here its vertical component of velocity will decrease with time
So maximum velocity is either initial velocity of the velocity when it will hit the ground again
(c) Can the velocity ever be the same as the initial velocity at a time other than at t = 0?
Answer:
No, it will never equal to its initial velocity
Explanation:
It is never equal to initial velocity because here its direction of motion will change with time and since velocity is a vector quantity so here its direction never equal to initial velocity.
(d) Can the speed ever be the same as the initial speed at a time other than at t = 0?
Answer:
Yes speed will be same when it will hit the ground again
Explanation:
Since we know by energy conservation law that here no frictional force acts on the object so energy will be same when it will hit the floor so here its speed will be equal to initial speed
