x v o t \u00bdat 2 x \u00bdat 2 2 xa t 2 t 2 2 xa 2 t x a 77 1 A ball is dropped from a

X v o t ½at 2 x ½at 2 2 xa t 2 t 2 2 xa 2 t x a 77

This preview shows page 68 - 83 out of 84 pages.

x = v o t + ½at 2 x = ½at 2 2 x/a = t 2 t 2 = 2 x/a / 2 t x a
Image of page 68
77 1. A ball is dropped from a very tall building. Find the ball’s position and velocity after 2 seconds.
Image of page 69
78 White board problems WB13) A book falls off .75 meter tall desk. a) How long does it take to reach the ground? What Equation do we need?
Image of page 70
79 A ball is thrown straight up in the air, find the acceleration and velocity at various points in its path. Gravity always causes an acceleration downward . v = 19.6 m/s, up a = 9.8 m/s 2 , down v = 19.6 m/s, down a = 9.8 m/s 2 , down v = 9.8 m/s, down a = 9.8 m/s 2 , down v = 0 m/s a = 9.8 m/s 2 , down v = 9.8 m/s, up a = 9.8 m/s 2 , down
Image of page 71
80 Ex 11) A rock is dropped from rest from a tall building. How far has it traveled after 3 seconds? 0 m/s ___ 9.8 m/s 2 3 sec x = v o = v f = a = t = ? m
Image of page 72
81 Ex 12) A ball thrown down from a 20 m tall building with a speed of 15 m/s. How fast is it moving when it hits the ground? (choosing up as positive) x = v o = v f = a = t = -20 m -15 m/s ? -9.8 m/s 2 ?
Image of page 73
82 Ex13) A ball thrown upwards from a 20 m tall building with a speed of 15 m/s. How fast is it moving when it hits the ground? x = v o = v f = a = t = -20 m 15 m/s ? -10 m/s 2 ?
Image of page 74
83 WB14) A ball is thrown with a velocity of 25 m/s straight up. (a)How much time does it take to reach the top of its path? x = v o = v f = a = t = ? 25 m/s 0 m/s at top - 10 m/s 2 ? v = v o + a t v - v o = a t 0 m/s – 25 m/s - 10 m/s 2 t = t = 2.5 s v f - v o a t = Solve the following problem completely:
Image of page 75
84 (b) How high does the ball go? x = v o = v f = a = t = ? 25 m/s 0 m/s at top - 10 m/s 2 2.5 s x = v o t + ½at 2 x = (25 m/s)(2.5 s) + ½(-10 m/s 2 )(2.5 s) 2 x = (62.5 m) + (- 31.25 m) x = 31.25 m
Image of page 76
85 White board problems WB15) A ball is dropped from a 45 meter tall building. a) How long does it take to reach the ground? b) how fast is it moving after 2 seconds? c) How fast is it moving when it hits the ground?
Image of page 77
86 White board problems WB15) A ball is dropped from a 45 meter tall building. a) How long does it take to reach the ground? b) how fast is it moving after 2 seconds? c) How fast is it moving when it hits the ground? 15) a) 3 seconds b) 20 m/s c) 30 m/s
Image of page 78
87 WB14) Hubble throws a bone straight up with a speed of 35 m/s a) For how much time is it in the air? b) What is its velocity after 3.5 seconds? c) What is its velocity after 4 seconds? d) What is its velocity after 5.3 seconds? e) How high does the bone go?
Image of page 79
88 WB14) Hubble throws a ball straight up with a speed of 35 m/s a) For how much time is it in the air? b) What is its velocity after 3.5 seconds? c) What is its velocity after 4 seconds? d) What is its velocity after 5.3 seconds? e) How high does the banana go? 14) a) 7 seconds b) 0 m/s (at top) c) -5 m/s d) -18 m/s e) 61.25 m
Image of page 80
89 WB15) A man stands on top of a tall building and throws a rock straight down at 15 m/s. It takes 4.5 seconds to hit the ground. a. How tall is the building? b. How fast is the rock traveling right before it hits the ground.
Image of page 81
90 WB15) A man stands on top of a tall building and throws a rock straight down at 15 m/s. It takes 4.5 seconds to hit the ground.
Image of page 82
Image of page 83

You've reached the end of your free preview.

Want to read all 84 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture