In an air-free chamber a pebble is thrown horizontally, and at the same instant

Question

In an air-free chamber a pebble is thrown horizontally, and at the same instant a second pebble dropped from the same height Compare the times of fall of the two pebbles. For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration A ball is thrown with an initial velocity of 20 m/s at an angle of 60 degree above the horizontal if we can negiect air resistance, what is tha horozontal component of its instantaneous velocity at the exact top of trajectory? A ball thrown horizontally from a point 24 m above the ground strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance A boy throws a rock with an initial velocity of 3.13 m/s: at 30.0 degree above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?

Explanation / Answer

12)

Here, as the same accleration due to gravity acts on both the pebbles and the initial

vertical component of velocity is zero

they both hit at the same time

13)

for no air resistance , as there is no force in horizontal direction

the horizontal component of acceleration is always ZERO

55)

at the top of trajectory

Vh = 20 * cos(60)

Vh = 10 m/s

the horizontal component of velocity os 10 m/s

59)

time of flight = sqrt(2*24/9.8)

t = 2.213 s

Now, speed = 18/2.213

speed = 8.1 m/s

the horizontal speed is 8.1 m/s

62)

time = v*sin(theta)/g

time = 3.13 * sin(30)/9.8

time = 0.160 s

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