Builders are testing a roller-coaster. The cart starts at rest at the top of a hill 40 m above the height of the dip below. The builders find that the cart reaches a height of only 25 m above the dip on the second hill where it momentarily stops. The total distance traveled is 400 m along the track. The cart’s mass is 1000 kg. What was the average friction force during the journey?

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

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.