An engineer must a runway to accommodate air planes that must reach a ground velocity of 61m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.5m/s^2. a)How long will it take the planes to reach takeoff speed?
b)What must be the minimum length of the runway?

Apossible explanation for a set of facts that can be tested by further investigation is called

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s