Q-two toy cars A and B are moving towards each other on a horizontal surface.The car A has mass of 60g and moves towards the right with a speed of 60cm/s. the car B has a mass of 100g moves toward the left with a speed of 20m/s . the 2 cars collide and get struck to each other . this indicates which law of motion ?
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The mass of car A, mA = 60 g = 0.06 kg
The speed of car A, vA = 60 cm/s = 0.6 m/s
The mass of car B, mB = 100 g = 0.1 kg
Speed of car B, vB = 20 m/s
Using law of conservation of momentum,
mAvA−→+mBvB−→=(mA+mB)v⃗ ⇒0.06×0.6−0.1×20=(0.06+0.1)v⃗ ⇒0.036−2=0.16v⃗ ⇒v⃗ =−1.9640.16=−12.275 m/sThe negative sign shows that the motion of the both the car is along the direction of initial motion of car B.Therefore, both the cars move towards left.
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