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```
THE DISPLACEMENT OF A PARTICLE STARTING from rest and moving under a constant acceleration is calculated by the formula S= 1/2 at^2 .if there occurs an error of 30% in the measurement of time interval , what error will be introduced in the calculation of S?

```
6 years ago

```							40.82%
```
6 years ago
```							i think i answered this question didnt u get it..?
```
6 years ago
```							here S= 1/2at² but due to error put S+dS instead of S and t+dt instead of t (here d is delta)
hence... S+dS=1/2a(t+dt)² =1/2a(t²+2tdt+[dt]²) .... here  S=1/2at²  hence they get cancelled out...  we get here is  dS=atdt+1/2a[dt]².....divide it by S=1/2at²...u would get
dS/S=2dt/t+[dt/t]²...(1)    it is given that dt/t=30/100=0.3 ...  now put this in equation (1)..
u would get dS/S=0.6+0.09=0.69=69% ... and that is the answer..
```
6 years ago
```							Given that (S= 1/2 at^2) and error is 30%

S`=(1/2) a(30*t/100)^2
=(1/2)*a*0.09*t^2
S`=0.09S

% error in S=(S-S`/S)*100
=((1-0.09)S/S)*100
=91%
```
6 years ago
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