Last Activity: 8 Years ago
Last Activity: 8 Years ago
Last Activity: 8 Years ago
Last Activity: 8 Years ago
Last Activity: 8 Years ago
Last Activity: 7 Years ago
His logic is right and s1 = 24m and s2= 40m but at last there is a calculation mistake it will be (3*40)/24 = 5 answer
Last Activity: 7 Years ago
On differentiating the given equation with respect to t we get,dx/dt(v)=16-4tand again differentiating we get acceleration(a)= -4Now the initial velocity I.e at t=0,will be(Initial)v=16We have to check when the displacement will equal to zero I.e particle will be at its initial position so putting x=o we get t=8 sec ,so at the 8 sec particle will be at initial position since the particle is moving on straight line so S1(distance travelled by the particle during the first two second) will come from the given equation by putting t=2 i.e S1=24Now if the particle`s displacement is zero at t=8sec we can conclude that it will move till 4sec and after that it will return back in the 5 sec, now the most important point here to consider is that displacement is time dependent which means that until 4th sec all the displacement will be different for each second but for the 5th sec it will be same as in the 4th sec and for the 6th sec it will be same as in the 3rd secNow for calculating S2 we have to calculate the distance travelled till the 4th sec and distance travelled in the fifth and sixth second, individuallyDistance travelled during first four second comes out to be 32 And now for calculating the distance travelled in 5th sec we have to calculate the distance travelled in 4th sec so by using formula, s=u+a(2n-1)/2 where u is initial velocity I.e 16 and a is acceleration I.e -4 and n=4sec we get the distance travelled in the 4th sec=2 and similarly in the 3rd sec we get the distance =6S2=32+2+6 I.e 40 3S2/S1=3*40/24 I.e 5 ans
Last Activity: 6 Years ago
Last Activity: 4 Years ago
Dear Student,
Please find below the solution to your problem.
For last 2 second, I mean after 4 seconds it stops and then start moving back.
so,
Retardation, = -4 m/s^2
at t = 2
Therfore,
x = 0 + 0.5*4*4 = 8 meter.
Thus, total distance it travelled is: 32 + 8 = 40m =S2
And hence, 3S1/S2 = 3*24/40 = 3*6/10 = 3*3/5 = 9/5
But it still is 9/5 not 5.
Thanks and Regards
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Get your questions answered by the expert for free
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 2 Years ago