Answer:
The length of the train in the frame of the lecture room is 40.59 m.
Step-by-step explanation:
Given that,
Speed = 0.894 c
Original length = 90.6 m
We need to calculate the length of the train in the frame of the lecture room
Using formula of length contraction

Where,
=original length
v = speed of train
Put the value into the formula



Hence, The length of the train in the frame of the lecture room is 40.59 m.