Physics Questions & Answers

Physics Questions & Answers A boy throws a rock with an initial velocity of 3.13 m/s at 30.0* above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g=9.8 m/s^2 A) 0.160 s B) 0.282 s C) 0.313 s D) 0.441 s - CORRECT ANSWER- A) 0.160 s A car travels 20km west and then 20km south. What is the magnitude of its displacement vector? A) 0 km B) 20 km C) 28 km D) 40 km - CORRECT ANSWER- C) 28 m A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What is the height of the cliff if air resistance is negligibly small? A) 22 m B) 43 m C) 77 m D) 91 m - CORRECT ANSWER- D) 91 m