The drawing shows an empty fuel tank about to be released by three different jet planes. at the moment of release, each plane has the same speed, and each tank is at the same height above the ground. however, the directions of the velocities of the planes are different. which tank has the largest speed upon hitting the ground? ignore friction and air resistance.

each tank hits the ground with same speed as above.

Explanation:

When fuel tanks are released there velocity u=0 m/s

all are released from the same height let it be h

let the velocity when they hit the ground be v

now using the equation

where g= acceleration due to gravity

put u=o and rearranging we get

clearly, velocity is only dependent on the height h, which is same for all hence, we conclude that each tank hits the ground with same speed as above.

no. dot product   =0 when vecs at right angles

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.