A 10-kg rock and 20-kg rock are dropped from the same height and experience no
significant air resistance. If it takes the 20-kg

Question

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time t to reach the ground, what time will it take the 10-kg rock to reach the ground? 
t 
2t 
4t 
t/2

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A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time t to reach the ground, what time will it take the 10-kg rock to reach the ground? Ot 2t O 4t Ot/2