8. a baseball is hit upward and travels along a parabolic arc before it strikes the se
the following statements must be true?
it strikes the ground. which of
a.
the acceleration of the ball
decreases as the ball moves upward.
c. the acceleration of the ball is zero
m/s when the ball is at the highest
point in the arc.
d. the x-component of the velocity of
the ball is the same througout the
ball's flight
b.
the velocity of the ball is zero m/s
when the ball is at the highest point
in the arc.

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle