4. A uniform force of (2 N) acts on a particle of mass 1 kg. The particle displaces from position (3 m) to (5+3) m. The work done by the force on the particle is:​

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

Determine the moment of the force f about an axis extending between a and c. express the result as a cartesian vector. a is at the origin, c is at (4,3,0) and f = (4i + 12j -3k) lb coming out of b (4,3,-2).