1. What is the gravitational potential energy of a 0.75kg ball resting at the edge of a roof that is 35m above the ground?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s

2. circled insects have mutations, or changes to their dna. how many of the offspring insects in this generation have mutations?

Five structural isomers have the formula c6h14. where needed, draw the structure and give the iupac name of all five isomers.