Explain, with reasons, whether the following contracts are valid, voidable or void:

Josh lost his wallet and mobile phone when he was travelling to work by bus. The next day, Josh received a call from a lady named Megan who found his wallet and mobile phone. Over the phone, Megan told Josh that "You must sell me your mobile phone for RM100 or else I will steal your bicycle, I know where your house is". Josh was too frightened that Megan was going to steal his bicycle and agreed to Megan but now regretted his decision. (6 marks)