Calculate the displacement and velocity at times of (a) 0.500 s, (b) 1.00 s, (c) 1.50 s, (d) 2.00 s, and (e) 2.50 s for a rock thrown straight down with an initial velocity of 14.0 m/s from the Verrazano Narrows Bridge in New York City. The roadway of this bridge is 70.0 m above the water.

a) 8.25 m and 19 m/s

b) 19 m and 24 m/s

c) 32.25 m and 29 m/s

d) 48 m and 34 m/s

e) 66.25 m and 39 m/s

Explanation:

Let gravitational constant g = 10m/s2

Formula for displacement:

Formula for velocity: v = v_0 + gt = 14 + 10t

a) at t = 0.5s

v = 14 + 10*0.5 = 14 + 5 = 19 m/s[/tex]

b) at t = 1s

v = 14 + 10*1 = 24 m/s

c) at t = 1.5 s

v = 14 + 10*1.5 = 29 m/s

d) at t = 2s

v = 14 + 10*2 = 34 m/s

e) at t = 2.5s

v = 14 + 10*2.5 = 39 m/s

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.