13. A brick is thrown upward from the top of a building at an angle of 25° to th

Question

13. A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 3.0 s, how tall is the building? um tha srindow of a huilding. a ball is tossed from a 17. A projectile is launched with an initial speed of 60.0 m/s at an angle of 30.0° above the horizontal. The projectile lands on a hillside 4.00 s later. Neglect air friction. (a) What is the pro- jectile's velocity at the highest point of its trajectory? (b) What is the straight-line distance from where the projectile was launched to where it hits its target? ne distance from where the pr

Explanation / Answer

13. initial vertical velocity,

v0y = v0 sin25 = 15 sin25 m/s

ay = - 9.8 m/s^2

yf - yi = v0y t + ay t^2 /2

0 - h = (15 sin25)(3) + (-9.8 x 3^2 / 2)

h = 25 m

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