1. how fast should a Boy of 40kg mass run so that the kinetic energy become 800joule? 2. an arrow thrown from a bow has 2500joule energy. If its mass is 100 gram, calculate its velocity.

If vx = 7.00 units and vy = -7.60 units, determine the magnitude of v⃗ . determine the direction of v⃗ .

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Blank liquids and gases exert a buoyant force on objects placed in them