The spring-loaded launcher fires a 5kg projectile. Readying the launcher compresses the spring by 30cm. Aimed straight up, the projectile reachers a hight of hmax=4.7 meters when launched.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

A15 ohm resistor and a 25 ohm resistor are connected in parallel to a 60 volt battery. what is the power used by each device