Why did the apostles perform wonders and signs in Acts 2?
The apostles performed wonders and signs because they were an extension of Christ's earthly ministry. Having received power from the Holy Spirit, they continued the works Jesus had done while He was in their midst, and fear came upon every soul as these signs were done.
Les explains that the apostles' wonders and signs were appropriate because they were an extension of Christ's earthly ministry. Jesus had said in Acts 1:8 that they would receive power, a kind of power that would continue to do what He had done while He was in their midst. The passage notes that fear came upon every soul, and these Jews were under the Spirit and the power of the Holy Spirit, so many wonders and signs were done by the apostles.
But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.