u = 7 m/s², t = 45 and s: 92.m then find a
Answers
◆【Acceleration】◆
As we know when a body in motion Cover some Distance (s) in time (t) , than we can define a Term called speed. As speed = s=/t....
But what If body cover some displacement IN time (t) So it's become less intuitive now this term is know as Velocity.
Which is define as the rate of change of Displacement of a body....
Now we come to know that what if Velocity is also changes with respect to time .
Let a body Has velocity u
and after some time(t) it's become v
So Acceleration = (v - u)/t
Acceleration Can be constant Or can be variable
◆ For Constant we can use Newton's Equation
◆ For variable we can use differential Equation
Your question is about constant Acceleration
so we can use second equation of motion
s = ut + (1/2)at²
92 = 7(45) + (1/2)a(45)²
92 = 315 + 2025a/2
-223 = 2025 (a/2)
-0.11 = a/2
Acceleration = -0.22m/sec²
Negative sign Shows that acceleration is in opposite direction to that of displacement