A plane flying horizontally above Earth’s surface at

150. meters per second drops a crate. The crate strikes
the ground 30.0 seconds later. What is the magnitude of
the horizontal component of the crate’s velocity just
before it strikes the ground?

I know the answer is 150 m/s but why?

10. A cannon elevated at an angle of 35º to the

horizontal fires a cannonball, which travels the path
shown in the diagram below. [Neglect air resistance and
assume the ball lands at the same height above the
ground from which it was launched.]
If the ball lands 7.0 × 10² meters from the cannon 10.
seconds after it was fired, what is the horizontal
component of its initial velocity?
(A) 7.0 m/s (B) 35 m/s (C) 49 m/s (D) 70. m/s

oops but that's another question

A plane flying horizontally above Earth's surface at 100. meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crate's velocity just before it strikes the ground?

To find the magnitude of the horizontal component of the crate's velocity just before it strikes the ground, we need to consider the fact that the plane is flying horizontally above Earth's surface.

Since the plane is flying horizontally, the vertical component of its velocity will be zero. This means that the only component we need to consider is the horizontal component.

We are given that the plane is flying at a speed of 150 meters per second. This means that its horizontal component of velocity is 150 meters per second.

When the crate is dropped from the plane, it will continue to move horizontally with the same velocity as the plane. This is because there are no horizontal forces acting on the crate to change its velocity.

Since the crate takes 30.0 seconds to strike the ground, it will continue to travel horizontally for this amount of time. Therefore, the magnitude of the horizontal component of the crate's velocity just before it strikes the ground is also 150 meters per second.

In conclusion, the magnitude of the horizontal component of the crate's velocity just before it strikes the ground is 150 m/s.