Question

9. A projectile is launched at some angle to the horizontal with ong the perpen- some initial speed w; air resistance is negligible. (a) Is the pro- jectile a freely falling body? (b) What is its acceleration in the vertical direction? (c) What is its acceleration in the horizontal direction? ccelera- suming projec 10. A baseball is thrown from the outfield toward the catcher. When the ball reaches its highest point, which statement is true? (a) Its velocity and its acceleration are both zero. (b) Its velocity is not zero, but its acceleration is zero. (c) Its veloc- ity is perpendicular to its acceleration. (d) Its acceleration depends on the angle at which the ball was thrown. (e) None of statements (a) through (d) is true. have an ith con- ith con- ng. One the same tion will always be me differ Can the anged so 11. A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed . At the same time, a second student drops a lighter blue ball from the same balcony. Neglecting air resistance, which statement is truei? (a) The blue ball reaches the ground first. (b) The balls reach the ground at the same instant. (c) The red ball reaches the ground first. (d) Both balls hit the ground with the same speed. (e) None of statements (a) through (d) is true. above the 12. A boat is heading due east at speed vwhen passengers onboard , velocity,
Can someone answer question 10 for me please. ?

Answer 1

At the highest point,the vertical component of velocity v_y becomes equal to zero. The baseball has only horizontal component of velocity v_x. But the baseball is acted upon by acceleration towards gravity and is directed towards the ground. If we look at the figure we can clearly see that acceleration due to gravity(g) is perpendicular to the horizontal component of velocity at the highest point.

"At the highest point, the vertical component of velocity V_Y becomes equal to zero. The baseball has only horizontal component of velocity vx. But the baseball is acted upon by acceleration towards gravity and is directed towards the ground. If we look at the figure we can clearly see that acceleration due to gravity(g) is perpendicular to the horizontal component of velocity at the highest point. Hence the correct option is �c' rightarrow ""It's velocity is perpendicular to its acceleration"""

Hence the correct option is 'c' -----> "It's velocity is perpendicular to its acceleration"