In object moving with a speed of 21M/S and has a kinetic energy of 140j, what is thr mass of the object

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?