www.webassign.net/web/S1 55 airport where the runway is 0.800 km long? No Need H

Question

www.webassign.net/web/S1 55 airport where the runway is 0.800 km long? No Need Help? 110 points SerCP102.R039 My Notes Ask Your Teac A car starts from rest and travels for 9.0 s with a uniform acceleration of +1.6 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.5 m/s2. If the brakes are applied for 1.0 s, determine each of the followina (a) How fast is the car going at the end of the braking period? m/s (b) How far has the car gone? Need Help? submit nswer Save l'roare Practice Another version 110 points Ser CP102.R046 My Notes Ask Your Teac A ball is thrown directly downward with an initial speed of 8.45 m/s, from a height of 30.6 m. After what time interval does it strike the ground?

Explanation / Answer

here,

for the accelrating period ,

time , t = 9 s

uniform accelration , a = 1.6 m/s^2

the final speed , v1 = 0 + a * t = 14.4 m/s

the distance travelled , s1 = 0 + 0.5 * a * t^2 = 0.5 * 1.6 * 9^2 = 64.8 m

for deaccelrating period

v2 = v1 + a2 * t2

v2 = 14.4 - 2.5 * 1

v2 = 11.9 m/s

s2 = v1 * t - 0.5 * a * t^2

s2 = 14.4 * 1 - 0.5 * 2.5 * 1^2

s2 = 13.15 m

a)

the speed of car at the end of braking period is 11.9 m/s

b)

the distance travelled by car , s = s1 + s2

s = 77.95 m

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