I only need help with number 3- I tried inputting answers (4.5, 7.5, 1.5, 2.5, and 4.2) and these are all incorrect.

The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.

What are the phases shown in a and d called?

When does your body conduct current more readily?