A baseball is hit upward and travels along a parabolic arc before it strikes the

Question

A baseball is hit upward and travels along a parabolic arc before it strikes the ground. Which one of the following statements is necessarily true? The x-component of the velocity of the ball varies throughout the ball's flight The acceleration of the ball decreases as the ball moves upward The y-component of the velocity of the ball is zero when the ball is at the highest point The velocity of the ball is a maximum when the ball is at the highest point in the arc The acceleration of the ball is zero when the ball is at the highest point in the arc A spacecraft is traveling with a velocity of +4349.7 m/s. Suddenly the retrorockets are fired, and the spacecraft begins to slow down with an acceleration whose magnitude is -11.235 m/s^2. How far does the spacecraft travel until it comes to a momentary halt? 8.42 times 10^5 m 6.13 times 10^5 m 9.46 times 10^5 m 3.17 times 10^5 m

Explanation / Answer

21) using third equation of motion,

s = v^2/2a

= 4349.7^2 /(2*11.235)

= 8.42*10^5 m

First option is correct

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