Batman drops his keys off a building that is 100 m tall and they fall straight down. he throws his grappling hook straight down 1 second after the keys fall to try to catch them. the initial velocity of the keys is 0 m/s and the initial velocity of the grappling hook is 10 m/s. when does the grappling hook catch the keys? (assume that the grappling hook is a simple projectile)

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine