Question

Projectile Motion: A rock is thrown into the air with an initial velocity of 40 m/s and 60 degrees above the horizontal. (a) What is the time when the velocity makes 45 degrees above the horizontal? (b) What is the time when the velocity makes 45 degrees below the horizontal? (c) Does it exist when the velocity makes zero degrees with the horizontal? If yes, when? (d) Does it exist when the velocity makes 90 (or -90) degrees with the horizontal? If yes, when?

Answer #1

an astronomer in the ground was thrown (projectile motion) to
space with initial velocity 14m/s her mass is 90 Kg. Calculate the
normal force.

5) A rock is thrown directly southeast (45 degrees to S and E),
at an initial velocity of 10 m/s, with an angle of elevation of 60
degrees. If the wind is blowing at a constant 2 m/s to the west,
where does the rock land?

In the 2-D
motion we throw a
projectile with initial
velocity of V0 =
30 (m/s) and 45
degrees above the
horizon. What is
the maximum height
and range for this
projectile? (to make
life easier g=10
m/s^2)

A): A projectile is given an initial velocity of 34.4 m/s at an
angle of 57.5 degrees with respect to the horizontal. How far has
it moved in the x-direction at the time when its speed in the
y-direction is 10.3 m/s?
b): A projectile is launched with an initial velocity of 31.5
m/s at 68.2 degrees with respect to the horizontal. What is the
speed of the projectile 1.05 s after being launched. Assume the
speed is measured in...

A stone thrown off a bridge 20 m above a river has an initial
velocity 14m/s of at an angle of 45 degrees above the horizontal.
What is the range of the stone? At what velocity does the stone
strike the water?

A rock is thrown straight upward from the top of a building with
an initial velocity of 15.0 m/s, at an initial height of 45.0 m
above the ground. The rock just misses the edge of the building’s
roof on its way down. The magnitude of the acceleration due to
gravity is 9.79 m/s2 (in Greeley).a. What is the time needed for
the rock to reach its maximum height?b. What is its maximum height
with respect to the ground?c. How...

A projectile is fired with an initial velocity of 75.0 m/s at an
angle of 33.0 degrees above the horizontal. It lands on a hillside
50m above the level from which it was fired. Determine 1) the time
of flight of the projectile. 2) the maximum height to which it
rises. 3) the horizontal distance from launching to landing
points.

A projectile is launched upward with an initial velocity of 25
m/s at an angle of 53 degrees above the horizontal.
How far will the projectile travel horizontally before it
reaches the same height it was launched from?
How long will the projectile be in the air if it is launched
from a height of 32 meters above flat ground?
The answers are 60m and 5.2s. Can you please show how to get to
that?

Projectile in 2D: A ball is thrown with initial speed V , at an
angle θ above the horizontal, over flat ground. Show that the
motion is restricted to a single plane. Neglecting air resistance,
find (a) the time taken for the ball to reach the ground; (b) the
maximum height reached by the ball; (c) the horizontal distance
travelled by the ball before hitting the ground (range); (d) the
kinetic and potential energies at the position of maximum height...

A rock is thrown from the edge of a cliff to the ground 17.0 m
below. The rock has an initial velocity of 20.0 m/s, directed 35.0°
above the horizontal. (a) How long does it take the rock to reach
the ground?
(b) How far from the base of the cliff does the rock strike the
ground?
(c) Find the velocity of the rock just before it strikes the
ground.
magnitude
direction
below the horizontal

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