An archer aims her arrow directly at the stem of a coconut hanging from a nearby palm tree in hopes of knocking it to the ground. At the precise moment she releases the arrow, the coconut loses its life-long battle with gravity and falls from the tree. Why will the arrow still hit the coconut?

The average thrust created by the first stage engine of a model rocket is 50N. The rocket has an average weight of 10N with a burn time of 2 seconds. The rocket is initially fired vertically upward. When the rocket reaches maximum height, a second engine is fired creating a horizontal velocity (only) of 50m/s. Where does the rocket land relative to its launch point? Assume it was launched on a horizontal plain.

*15-20. The 200-lb cabinet is subjected to the force F=20(1+1) lb where t is in seconds. If the cabinet is initially moving to the left with a velocity of 20 ft/s, determine its speed when t= 5 s. Neglect the size of the rollers. 30°

H = 0 d= 10 cm red Vo 45° 45° Volue

A basketball player jumps straight up for a ball. To do this, he lowers his body 0.270 m and then accelerates through this distance by forcefully straightening his legs. This player leaves the floor with a vertical velocity sufficient to carry him 0.940 m above the floor.

A baseball with mass of 0.16 kg is batted into the air. Its initial speed is 37.7 m/s, directed at an angle 30 degrees above the horizontal. After 0.10 seconds, what is the horizontal component of the ball's velocity (in m/s)?

You and a friend throw identical balls with the same initial speed. You throw yours at an angle of 30ﾟ to the horizontal, and your friend throws hers at 60ﾟ. Which ball travels the greatest horizontal distance? Ignore resistance.

Dandelion seeds have a plume made of thin filaments that create a very large drag coefficient due to subtle aerodynamics as the air moves through and past the plume. The slower terminal speed and longer time in the air provide greater dispersal than would be possible for simple spherical seeds. A 0.63 mg seed has a plume with a cross-section area of 13 mm, and it falls with a terminal speed of 40 cm/s.

Grains from a hopper falls at a rate of 10 kg/s vertically onto a conveyor belt that is moving horizontally at a constant speed of 2 m/s. (a) What force is needed to keep the conveyor belt moving at the constant velocity?