8. 2 points SerCP102.P029. My Notes Ask Your Teache A truck covers 40.0 m in 8.6

Question

8. 2 points SerCP102.P029. My Notes Ask Your Teache A truck covers 40.0 m in 8.60 s while uniformly slowing down to a final velocity of 2.55 m/s. (a) Find the truck's original speed. m/s (b) Find its acceleration m/s 2 Need Help? Rese 9. 14 points SerCP10 2 P.045 Notes Ask Your Teache A ball is thrown vertically upward with a speed of 26.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the level from which it started? (Assume the positive direction is upward. Indicate the direction with the sign of your answer.) m/s Need Help? Read

Explanation / Answer

8] By using,

v = u + at

2.55 = u +a*8.60  

u + 8.60a = 2.55 ...eq1

s = ut + 0.5at^2

40 = 8.6u + 0.5a*8.60^2

u + 4.3a = 4.65 ...eq2

b] solving both eq,

a = (2.55 - 4.65)/(8.6 - 4.3)

= - 0.5 m/s^2

a] From eq1,

u = 2.55 - 8.6*(-0.5)

= 6.85 m/s answer

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