If the velocity of a particle is zero, can the particle's acceleration be zero? Give an example. If the velocity of a particle is not zero, can the particle's acceleration be zero? Give an example.

Question 1 When a projectile is at its' maximum height: O The vertical component of velocity is zero O The vertical position is zero The acceleration is zero O The horizontal component of velocity is zero Question 2

4. A hockey player makes a shot 4m away from goal at a horizontal velocity of 15 m/s. How long does the goalie have to react to the shot?

2 airplanes leave an airport at the same time. the velocity of the 1st airplane is 680 M/H at a heading of the 51.6 Degrees the velocity of the 2nd is 640M/h at a heading of 176ﾟ how far apart are they after 2 . 3 hour answering units of M

A child running in a field has the following position and velocity at time t=0:                                                                                                                                x = 1.5 m. v= -2.0 m.                                Vx =-3.5 m/s, vy = 1.0 m/s                                                                                                                                                                 At time t = 2.5 s, it has the following position and velocitv:                                                                                                                                                                   x = -1.0 m, y = 1.5 m 08.                          Vx = -0.50 m/s, Vy = 2.0 m/s                                                                                                                                                         Using this information, find the magnitude and direction of the child's…

A certain volcano on the Earth can eject rocks vertically to a maximum height H. How high (in terms of H) would these rocks go if a volcano on a planetary object ejected them with the same initial velocity? The accelerations due to the gravity on the Earth and the planetary object are 9.8m/s² and 3.1 m/s?, respectively. Neglect the effect of the air on both planets. 답:

If you fire a projectile at various speeds, does this change the time that the projectile is in the air? Explain why or why not?

A basketball player shoots when he is 5m away from the backboard. If the ring is 3m high, the basketball player is 2.1 m tall and if the distance from the backboard to the ring is 435 mm. Determine the initial velocity of the player if it is released at an angle of 30 degrees with the horizontal