Need help, got 10 incorrect so far. Apparent hints are Thrown down Negative valu

Question

Need help, got 10 incorrect so far. Apparent hints are

Thrown down

Negative values?

Time later?

Really need help.

Calculate the displacement and velocity for a ball 0.500 s after it was thrown straight down with an initial velocity of 12.9 m/s from the Verrazano Bridge in New York City. The roadway of this bridge is 70.0 m above the water. Displacement7.8m Velocity 7.995m/s Incorrect. Tries 5/5 Previous Tries Calculate the displacement and velocity for a ball 1.00 s later. Displacement 52.8m Velocity 22.71m/s Incorrect. Tries 5/5 Previous Tries Calculate the displacement and velocity for a ball 1.50 s later. Displacement Velocity - Submit Answer Tries 0/5 Calculate the displacement and velocity for a ball 2.00 s later. Displacement Velocity - Submit Answer Tries 0/5 Calculate the displacement and velocity for a ball 2.50 s later. Displacement Velocity - Submit Answer Tries 0/5

Explanation / Answer

viy=-12.9m/s, t=0.5s

y= viy*t-1/2gt2

y= -12.9*0.5-1/2*9.8*0.52

y= -7.67m

vfy= viy – gt

vfy= -12.9 – 9.8*0.5

vfy= -17.8m/s

viy=-12.9m/s, t=1.0s

y= viy*t-1/2gt2

y= -12.9*1.0-1/2*9.8*1.02

y= -17.8m

vfy= viy – gt

vfy= -12.9 – 9.8*1.0

vfy= -22.7m/s

viy=-12.9m/s, t=1.5s

y= viy*t-1/2gt2

y= -12.9*1.5-1/2*9.8*1.52

y= -30.37m

vfy= viy – gt

vfy= -12.9 – 9.8*1.5

vfy= -27.6m/s

viy=-12.9m/s, t=2.0s

y= viy*t-1/2gt2

y= -12.9*2.0-1/2*9.8*2.02

y= -45.4m

vfy= viy – gt

vfy= -12.9 – 9.8*2.0

vfy= -32.5m/s

viy=-12.9m/s, t=2.5s

y= viy*t-1/2gt2

y= -12.9*2.5-1/2*9.8*2.52

y= -62.87m

vfy= viy – gt

vfy= -12.9 – 9.8*2.5

vfy= -37.4m/s

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