A passenger on a train accelerating northwords at 2m/s2 drops a book. What is th

Question

A passenger on a train accelerating northwords at 2m/s2 drops a book. What is the acceleration of the book as measured by the passenger and as measured by a stationary person outside the train? Explain. Two joggers approach each other at an angle. Jogger l's velocity is and jogger when each are measured by a stationary observer. Find the vector velocity and the speed of jogger 2 as measured by jogger 1? A person on an elevator accelerating upwards at 1.5m/s2 drops a baseball. Assuming that the baseball was dropped from a height of 2m above the elevator floor, find the time it takes for the baseball to hit the floor.

Explanation / Answer

1. from inside: downward acceleration will be 'g'

from outside, the acceleration will be the vector sum of the two: sqrt ( 22+9.82) = 10.001 at an angle tan-1(4.9) degrees with respect to the horizontal.

2. jogger 2's velocity will appear as the vector subtraction i.e. (3i +2j)-(2i) = i + 2j m/s

3. the relative acceleration of the ball = (9.8 + 1.5)m/s^2 = 11.3 m/s^2

time required = sqrt ( 2*h/a ) = 0.59 seconds

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