A ball is thrown horizontally from a height of 20 m and hits the ground with a speed that is three times its initial speed. What is its initial speed?

An attacker at the base of a castle wall 3.80 m high throws a rock straight up with speed 8.40 m/s from a height of 1.40 m above the ground. (a) Will the rock reach the top of the wall? Yes, No     (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? m/s(c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.40 m/s and moving between the same two points. m/s(d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? Yes, No     (e) Explain physically why it does or does not agree.

A rock is thrown from the top of a building 94 m high, with a speed of 14 m/s at an angle 33 degrees above the horizontal. When it hits the ground, what is the magnitude of its velocity (i.e. its speed).

If you drop an object from a height of 1.3 m, it will hit the ground in 0.51 s. If you throw a baseball horizontally with an initial speed of 24 m/s from the same height, how long will it take the ball to hit the ground?

You toss an apple horizontally at 8.4 m/sm/s from a height of 2.0 mm. Simultaneously, you drop a peach from the same height. How long does apple take to reach the ground? How long does peach take to reach the ground?

An attacker at the base of a castle wall 3.60 m high throws a rock straight up with speed 7.50 m/s from a height of 1.60 m above the ground. a) what is its speed at the top? If not, what initial speed must it have to reach the top? b) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.50 m/s and moving between the same two points. c) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? d) Explain physically why it does or does not agree.

An object is launched horizontally at a height of 30 m with an initial velocity of 20 m/s. The x-component of the initial velocity is:    answer choices 20 m/s 0 m/s 15 m/s not enough information

A projectile is thrown from the top of a cliff with an initial speed of 25 m/s at an angle of 600 up from the horizontal. If the projectile lands 100 m from the base of the cliff how tall is the cliff?

A student launches a small rocket which starts from rest at ground level. At a height h=1.04km, the rocket reaches a speed of vf=391m/s. At that height, the rocket runs out of fuel, so there is no longer any thrust propelling it. After the rocket's engine turns off at a height of h=1.04km, it continues to move upward due to the velocity that it reached. What is the rocket's acceleration, in meters per squared second, during the period from engine shutoff until it returns to the ground? Ignore air resistance.

A stone is thrown with an initial speed of 20 m/s at an angle of 35° above the horizontal from the top of a 53 m building. What is the speed of the rock as it strikes the ground (ignore air resistance).