EGN 3321 Lecture 2: dynamics lecture_2.pdf
Document Summary
The three kinematic equations can be integrated for the special case when acceleration is constant (a = ac) to obtain very useful equations. A common example of constant acceleration is gravity; i. e. , a body freely falling toward earth. In this case, ac = g = 9. 81 m/s2 = 32. 2 ft/s2 downward. These equations are: a v t a dt v yields t c c v dv v s ds s t dt v yields s s v (1/2) a t t. 2 c s a c v dv v v ds yields. Given: ball a is released from rest at a height of 40 ft at the same time that ball b is thrown upward, 5 ft from the ground. The balls pass one another at a height of. Find: the speed at which ball b was thrown upward. Plan: both balls experience a constant downward acceleration of 32. 2 ft/s2 due to gravity.
