A 3.20-kg cart has mounted on it a fan, which provides a forward facing thrust of 20.0N If the cart is turned on, now long will it take the cart to go from rest to a speed of 14.0m/s ? Slacker Bob finds a jetpack and straps it on. Going straight up, Slacker Bob finds that they are moving with a speed of 6.00m/s upward when 30.0m above the ground. What force is being exerted by the jetpack? (Neglect the mass of the jetpack.)