Bridge physics and a record player. and explain your reasoning. All problem part

Question

Bridge physics and a record player. and explain your reasoning. All problem parts on this page will count or be dropped together as one. A student flicks a small (m = 50.0 g) rock off the concrete deck of the Westover Bridge while another student records a video of this experiment. The video shows the rock leaving the bridge and falling into the Monongahela River below. Later, they take the video to their physics instructor, who helps them determine two pieces of data about the experiment: The initial velocity of the rock v vector_0 was 3.22 m/s (perfectly horizontal) and the rock hits the water at t = 2.75 s after it left the deck. Neglect whatever air friction the rock may experience and use g = 9.80 m/s^2. a. Determine the vertical distance, in meters, between the deck of the bridge and the surface of the water. b. What is its kinetic energy, in Joules, just before impact?

Explanation / Answer

b)The question is asking for the kinetic energy of the block just before it hits the water

Horizontal speed of block = 3.22 m/s

Initial vertical component of velocity = 0

Time taken to fall = 2.75 s

Acceleration due to gravity = 9.8 m/s2

Vertical velocity of block just before hitting water = 0+(9.8*2.75)=26.95m/s

Speed of block = sqrt(3.222+26.952)=27.14m/s

kinetic energy = (1/2)mv2 = (1/2)*0.05*27.142=18.42 Joules

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