Arailway car having a total mass of 5.8 × 105 kg, moving with a speed of 9.1 km/h, strikes another car that has a mass of 8.7 × 105 kg and is initially at rest. the speed of the coupled cars after the collision is

a) 9.1 km/h.
b) 7.2 km/h.
c) 3.6 km/h.
d) 1.8 km/h.
e) 4.2 km/h

Final speed of both the cars, V = 3.28 km/h

Explanation:

It is given that,

Mass of the railway car,

Initial speed of the railway car,

Mass of another car,

Initial speed of another car,

To find,

The speed of the coupled cars after the collision.

Solution,

It is a case of inelastic collision in which the linear momentum before and after the collision remains same. Let V is the coupled velocity of both of the cars. So,

V = 1.011 m/s

or

V = 3.28 km/h

So, the speed of the coupled cars after the collision is 3.28 km/h. Hence, this is the required solution.

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one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.