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Motion in A Plane
Question
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Two trains 120 m and 80 m in length are running in opposite direction with velocities 42 km/hr and 30 km/hr. In what time they will complete cross each other? 

Answer

Relative velocity of one train w.r.t second, 
= 42 - (-30)
= 72 km /hr
= 20 m/s 
Total distance to be travelled = 120 + 80 = 200 m
Time taken  = 200/20 = 10 sec

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Some More Questions From Motion in A Plane Chapter

What is a scalar quantity?

What is a vector quantity?

Give three examples of scalar quantities.

Give three examples of vector quantities.

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

Is a physical quantity, having a direction, necessarily a vector?

Name a quantity which is both scalar as well as vector.

Which of the followings is/are vector quantities: work, power, acceleration, mass, momentum?

Pick up the odd one from the following: force, linear momentum, mass, impulse.

Pick out the only vector quantities in the following list:
Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction and charge.