Answer:
Approximately 
(assuming that the projectile was launched at angle of 
above the horizon.)
Explanation:
Initial vertical component of velocity:
.
The question assumed that there is no drag on this projectile. Additionally, the altitude of this projectile just before landing 
is the same as the altitude 
at which this projectile was launched: 
.
Hence, the initial vertical velocity of this projectile would be the exact opposite of the vertical velocity of this projectile right before landing. Since the initial vertical velocity is 
(upwards,) the vertical velocity right before landing would be 
(downwards.) The change in vertical velocity is:
.
Since there is no drag on this projectile, the vertical acceleration of this projectile would be 
. In other words, 
.
Hence, the time it takes to achieve a (vertical) velocity change of 
would be:
.
Hence, this projectile would be in the air for approximately .
<span>Electromagnetic, Strong Nuclear, Weak Nuclear, and Gravity</span>
The answer is true. The table does show an object moving with changing speed.
Answer:
a. Your acceleration decreases, but never goes to zero.
Explanation:
Pushing down with hands on the blanket increases the normal force between the soil and the blanket and, therefore, increases the friction force. Nonetheless, the component of the gravity force parallel to the direction of the slide is higher than friction force and consequently, the acceleration decreases but never goes to zero.
