Motion In One Dimension Question 2
Question 2 - 2024 (01 Feb Shift 2)
Train A is moving along two parallel rail tracks towards north with speed $72 km / h$ and train B is moving towards south with speed $108 km / h$. Velocity of train B with respect to A and velocity of ground with respect to $B$ are $\left(\right.$ in $\left.ms^{-1}\right)$ :
(1) -30 and 50
(2) -50 and -30
(3) -50 and 30
(4) 50 and -30
Show Answer
Answer: (3)
Solution:
B $\downarrow 30 m / s$
$A^{\uparrow} 20 m / s$
$V _A=20 m / s$
$V _B=-30 m / s$
Velocity of B w.r.t. A
$V _{B / A}=-50 m / s$
Velocity of ground w.r.t. B
$V _{G / B}=30 m / s$
