If an object dropped from the height of 144 ft the function h(t)=-16t^2+144 gives the height of the object after t seconds. when will the object hit the ground?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)