Physics Questions & Answers

Physics Questions & Answers A ball starting from rest at the top of an inclined plane gains a speed of 2 m/s for each second it rolls. What is its acceleration down the incline? - CORRECT ANSWER- 2 m/s A ball tossed vertically upward rises, reaches it highest point , and then falls back to the starting point. During this time the acceleration of the ball is always - CORRECT ANSWER- directed downward A car's speed 3 seconds after accelerating from rest 2m/s - CORRECT ANSWER- 6m/s a cart changes its speed from 90 m/s to 100 m/s in 10 . During this interval to acceleration. - CORRECT ANSWER- 1 m/s A cart maintains a constant velocity of 100 m/s for 10 s. During this interval its acceleration - CORRECT ANSWER- zero A freely-falling watermelon falls with constant - CORRECT ANSWER- acceleration A hockey puck sliding across the ice finally comes to rest because - CORRECT ANSWER- of friction A mosquito flying at 3 m/s that encounters a breeze blowing at 3m/s in the same direction has a speed of - CORRECT ANSWER- 6 A mosquito flying at 3 m/s that encounters a breeze blowing at 3m/s the opposite direction - CORRECT ANSWER- 0 A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor. - CORRECT ANSWER- exactly below the midpoint of the ceiling