- #1

maiku

## Main Question or Discussion Point

Kinematics in Two dimensions, from

A tennis ball is struck such that it leaves the racket horizontally with a speed of 28 m/s. The ball hits the court at a horizontal distance of 19.6 m from the racket. What is the height of the tenis ball when it leaves the racket?

-I've now clue how to solve this. . .

A spacecraft is traveling with a velocity of 5480 m/s along the +x direction. Two engines are turned on for a time of 842 s. One engine gives the spacecraft an acceleration in the +x direction of 1.20 m/s2, while the other gives it an acceleration in the +y direction of 8.40 m/s2. At the end of the firing, find Velocity in the x direction and the Velocity in the x direction.

-I don't even know where to begin. . .

I worked at these for an hour and a half last night, but I couldn't figure them out.

*Cutnell & Johnson Physics*:A tennis ball is struck such that it leaves the racket horizontally with a speed of 28 m/s. The ball hits the court at a horizontal distance of 19.6 m from the racket. What is the height of the tenis ball when it leaves the racket?

-I've now clue how to solve this. . .

A spacecraft is traveling with a velocity of 5480 m/s along the +x direction. Two engines are turned on for a time of 842 s. One engine gives the spacecraft an acceleration in the +x direction of 1.20 m/s2, while the other gives it an acceleration in the +y direction of 8.40 m/s2. At the end of the firing, find Velocity in the x direction and the Velocity in the x direction.

-I don't even know where to begin. . .

I worked at these for an hour and a half last night, but I couldn't figure them out.

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