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CBSE Class 11-science Answered

In the graphic seen, find the (a) Speed of trolley with respect to person (2) (b) Speed of person (1) with respect to person (2).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
(a)  
We want to find Vt2= velocity of trolley with respect to person 2. 
the velocity of the trolley with respect to the ground, Vtg=20m/s 

             And the velocity of person 2 with respect to ground V2g=-2m/s. 
      Also, since Vab= - Vba, we know that Vg2= +2m/s.
             Using our formula, we have:
             Vt2 = Vtg+ Vg2 = 20 m/s + 2m/s = 22 m/s. 

 (b)
             We want to find
       V12=V1g+Vg2. 
       Vg2 = 2m/s                                                                                                                 we know V1t = -5m/s, and
            Vtg = +20 m/s. 
      Therefore V1t + Vtg=15m/s=V1g
             So, V12= 15 m/s + 2 m/s = 17 m/s towards right.
 
 
 
 

 
Answered by | 04 Jun, 2014, 03:23: PM

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