Is there anybody could answer these two questions? 1.n object moves at a constan

Question

Is there anybody could answer these two questions?

1.n object moves at a constant velocity of 5.5 m/s to
the southwest for an interval of 20 s. Halfway through
this interval, what is the magnitude of its instantaneous
velocity?

1. 11 m/s
2. It can be any value from 0 to 22 m/s.
3. More information is needed.
4. 5.5 m/s

2.A student throws a heavy red ball horizontally from
a balcony of a tall building with an initial speed v0.
At the same time, a second student drops a lighter blue
ball from the same balcony. Neglecting air resistance
, which statement is true?

1. The balls reach the ground at the same instant.
2. The blue ball reaches the ground first.
3. The red ball reaches the ground first.
4. Both balls hit the ground with the same speed.

thanks a lot in advance:)

Explanation / Answer

1) If an object moves at a constant velocity of 5.5 m/s, then thatmeans that at any point you choose, its velocity will be 5.5 m/s.Thus, the answer is (4). 2) Acceleration due to gravity affects all objects equally, so itdoesn't matter that their weights are different. Both will bepulled downward by gravity at the same rate. Likewise, thehorizontal velocity given to the first ball doesn't matter, becauseall that matters in how long it takes the ball to hit the ground isits vertical velocity. Thus, they will hit at the sametime, and so the answer is (1). Note that (4) is not correctbecause as the red ball hits the ground, its vertical velocity isthe same as the blue ball's, but it also has a horizontalvelocity component, so the total velocities of the two balls arenot the same.

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