Calculate the tangential speed of a yo-yo twirled at the end of a 4 meter long string at 2 revolutions per second.

The slope of a velocity time graph over any interval of time gives the during that interval

If forces acting on an object are unbalanced. true or false

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)