Question 4 (2 points)
A toy plane is thrown upward with an initial velocity of 7 meters per second from an
initial height of 4 meters.
About how much time does it take for the plane to hit the ground?

t = 1.15 + .713 = 1.863 [s]

Explanation:

To solve this problem we must use the following kinematic equation, but first we identify the initial data.

vo = 7 [m/s]

yo = 4 [m]

g = 9.81[m/s^2]

The final velocity happens at the moment when the maximum height is reached, at this point the final speed is zero.

The total elevation will be 2.5 + 4 = 6.5 [m]

Now using again the total height we can find the final velocity.

With this final velocity we cand find the time.

Now we have to sum the two times, the time it takes to go up and the time it takes to go down.

t = 1.15 + .713 = 1.863 [s]

d they tend to lose electrons and become cations.

explanation:

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be