Two identical freight cars roll toward one another, on a level track with negligible friction. One car is moving at 2 m/s and the other car at 1 m/s. After the collision, both cars are coupled and roll together with what speed?

the answer is d. 4

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battery with hi vtge high val resist in series

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft