Help with these 2 questions please.

I am confused about which term is and , also and

1. There are 1000000 muons formed at an altitude of 15000m, taking time dilation into account find how long it would take the muons to reach the ground if they were travelling the 0.994c .

2. There are 1000000 muons formed at an altitude of 15000m, taking length contraction into account find the contracted length the muons travel.

Thanks

I am confused about which term is and , also and

1. There are 1000000 muons formed at an altitude of 15000m, taking time dilation into account find how long it would take the muons to reach the ground if they were travelling the 0.994c .

2. There are 1000000 muons formed at an altitude of 15000m, taking length contraction into account find the contracted length the muons travel.

Thanks

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