In the Chapter Motion the three equations of motion how will be determine which equation will be applied in a given numerical/word problem?

Asked by nayonika.online.learning | 6th May, 2018, 12:41: AM

Expert Answer:

eqn.(1)  v = u + a×t
 
eqn.(2) s = u×t + (1/2)a×t2
 
eqn.(3) v2 = u2+2×a×s
 
v = final speed/velocity, u = initial speed/velocity , a = acceleration, t = time, s = distance travelled.
 
In each equation, we have four variables. we will be given the value of three variables and we have to find the fourth unknown variable.
 
for example to get distance travelled we can use eqn.(2) or eqn.(3) depends on known variables. If we know initial velocity u, acceleration a, then we can get the distance travelled in t seconds using eqn.(2). On the other hand if we know initial and final speeds and acceleration, then we can use eqn.(3) to get the distance travelled.
 
hence if you are intersted to find value of one variable, first you find the equation that involves the variable and make sure other three variables are known, then use that equation to get the value of required variable.

Answered by Thiyagarajan K | 6th May, 2018, 12:58: PM

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