(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

#1

A student stands at the edge of a cliff and throws a stone

horizontally over the edge with a speed of 18 m/s. The cliff is 50 m above a flat horizontal beach. How long after being released does the stone strike the beach below the cliff ? With what speed and angle of impact does it land ?

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#2

A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 10 m/s. The student throws a ball along a path that she judges to make an initial angle of 60*, with the horizontal and to be in line with the track. The student's professor, who is standing on the ground nearby, observes the ball to rise vertically. How high does the ball rise.

2. The attempt at a solution

#1

Vx0 = 18 m/s

d = rt --> x = 18t

Dy = -50 m

a = -9.8 m/s2

-50 = (1/2)(-9.8)t2

which t2 = negative, it is imposible

#2

Vx0 = 10 m/s

Vx0 = 10 (cos 60*) = 5 m/s

Vy0 = 10 (sin 60*) = 8.7 m/s

Am I on the right track on both problem ? Can you guys help me ?

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# Homework Help: Projectile Motion of a thrown stone

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