Please help quickly its for my exam lol. Find the potential difference and then please explain it in b.

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

Determine the maximum r-value of the polar equation r =3+3 cos 0

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.