Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 decade ago

3 short physics questions about speed and acceleration!?

A woman stands at the edge of a cliff, holding one ball in each hand. At time t0, she throws one ball straight up with speed v0 and the other straight down, also with speed v0.

For the following questions neglect air resistance. Take upward to be the positive direction.

Which ball has the greater acceleration at the instant of release?

a. the ball thrown upward

b. the ball thrown downward

c. Neither; the accelerations of both balls are the same.

Which ball has the greater speed at the instant of release?

a. the ball thrown upward

b. the ball thrown downward

c. Neither; the speeds are the same.

Which ball has the greater average speed during the 1-s interval after release (assuming neither hits the ground during that time)?

a. the ball thrown upward

b. the ball thrown downward

c. Neither; the average speeds of both balls are the same.

2 Answers

Relevance
  • John B
    Lv 6
    1 decade ago
    Favorite Answer

    I'm not going to do your homework for you but I can give you hints.

    1. Acceleration is due to force (F=ma). After the balls are released, what force or forces are affecting the balls?

    2. This is kind of a trick question because the question tells you the speed of the balls at the instant of release.

    3. Think about how the acceleration of each of the balls will affect its speed. Remember that acceleration can be both positive and negative (because it is directional).

  • Steve
    Lv 7
    1 decade ago

    c

    c

    b

Still have questions? Get your answers by asking now.