(Answered) Evaluate maximum

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Problem 1. My son jumps on his stomp rocket and it takes off with an initial speed of 9.8 m/s starting from the ground.

a. When does it reach its maximum altitude?

b. How high did it go?

c. When does it hit the ground?

Problem 2. My son now jumps on his stomp rocket and it goes up 6 meters starting from the ground.

a. When does it reach its maximum altitude?

b. How high did it go?

c. When does it hit the ground?

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