Find kinetic energy

10) A 7500 kg streetcar starts from rest when the conductor draws 5 kW of power from the line. If this input is maintained constant and if the mechanical efficien- cy of the motors is 90%, how long does the streetcar take to reach a speed of 10 km/hr? Neglect wind resistance. ΟΙΟ ao

2. A 20-g bullet is travelling at 400 m/s when it becomes embedded in a 3-kg stationary block. The coefficient of kinetic friction between the block and ground is 0.2 Use the principle of linear momentum and impulse to determine the velocity of system immediately after the bullet becomes embedded. Then, use the work-energy theorem to determine the distance that the block will slide before it stops. The frictional force between the block and surface can be neglected during the initial impact but cannot be neglected when analyzing the sliding distance of the block. #A

Derive a general formula for projectile motion with the object launched at an angle.