Some problems will only tell you how fast an object was moving in the beginning, how fast it began to accelerate, and how long the object traveled for.  You will need the following formula.  The formula for this problem is as follows: S = ut + 1/2at².  "U" still represents initial velocity; "A" is the object's acceleration, or how fast its velocity begins to change.  "T" can either mean the total time taken, or it can be a certain amount of time an object accelerated for.  Either way, it will be identified by units of time such as seconds, hours, etc. Say a car traveling at 25 m/s (initial velocity) begins accelerating at 3 m/s2 (acceleration) for 4 seconds (time).  What is the displacement of the car after 4 seconds? Unlike the previous formula, only initial velocity is represented here, so be sure you input the correct data. Based on the example data above, your formula should look like this: S = 25(4) + 1/2(3)4².  It will help if you add parentheses around your acceleration and time values to help you keep the numbers separate. A quick way to help you remember the order of operations is the mnemonic "Please excuse my dear Aunt Sally."  This represents the correct order of parentheses, exponents, multiplication, division, addition, and subtraction. Let's revisit the formula: S = 25(4) + 1/2(3)4².  First, square 4, which gives you 16.  Then multiply 16 by 3, which gives you 48; also multiply 25 by 4, giving you 100.  Divide 48 by 2, which is 24.  Your equation should now look like this: S = 100 + 24.  Once you add the two values together, displacement will equal 124 meters.
استخدم معادلة معدلة حين تكون العجلة معلومة وكذلك السرعة الابتدائية والزمن. ضع القيم في أماكنها من المعادلة. احسب الإزاحة حسب أولوية العمليات.