need help 3.6 Suppose you are carrying a ball and running at constant speed, and
ID: 1326295 • Letter: N
Question
need help 3.6 Suppose you are carrying a ball and running at constant speed, and wish to throw the ball and catch it as it comes back down. Neglecting air resistance, should you (a) throw the ball at an angle of about 45 above the horizontal and maintain the same speed, (b) throw the ball straight up in the air and slow down to catch it, or (c) throw the ball straight up in the air and maintain the same speed? 3.7 As a projectile moves in its parabolic path, the velocity and acceleration vectors are perpendicular to each other (a) everywhere along the projectile's path, (b) at the peak of its path, (e) nowhere along its path, or (d) not enough information is given.Explanation / Answer
3.6
a) is wrong because the ball will have an additional horizontal component of velocity and will be always ahead of the runner who is traveling at the same speed(velocity)
b) is wrong because horizontal component of ball will be larger than that of the runner
c) is correct assuming that he is running in straight line.
3.7
b is correct
At the peak the velocity is horizontal and vertical component becomes zero and acceleration is always vertically downwards.
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