What force must be applied to move a 251 kg rock on a pavement like surface

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

What are atoms of the same element with varying number of neutrons

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.