Is this SSD designed to be durable if the computer is dropped?

Yes. The product description says it is shock-resistant for proven durability, even if you drop your computer, and the overview also mentions shock and vibration resistance.

What read and write speeds does this 500GB SanDisk SSD Plus model support?

This 500GB model is listed with read speeds up to 545MB/s. The product description also notes write speeds up to 515MB/s for the 1-2TB models.

Questions & Answers: SanDisk SDSSDA-500G-G28 SSD Plus 500GB Internal Solid State Drive SATA III 6Gb/s,2.5"/7mm Read/Write Speeds up to 545MB/s

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SanDisk SDSSDA-500G-G28 SSD Plus 500GB Internal Solid State Drive SATA III 6Gb/s,2.5"/7mm Read/Write Speeds up to 545MB/s

Easy upgrade for fast boots and application launches
High capacities for applications and large media files
Sequential Read speeds of up to 545MB/s and write speeds of up to 515MB/s(2) [1-2TB(1) models]
Shock-resistant for proven durability(3) - even if you drop your computer

$134^.99 –