![]() You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. 2.9 seconds The sum of two vectors of fixed magnitudes has its minimum magnitude when the angle between these vectors is 180 degrees You are trying to cross a river that flows toward the south with a strong current. If the height of the bridge is 41 m, how long will it take for the stone to hit the water? Neglect air resistance. How high is the building, assuming negligible air resistance? 70 m To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. What is the average acceleration of the particle between t=1.0 s and t=2.0 s? -15 m/s^2 A ball is thrown downward from the top of a building with an initial speed of 25 m/s. How far does it travel after starting? 400 m The velocity v(t) of a particle as a function of time is given by v(t)=(2/3 m/s) + (4.1 m/s^2)*t-(6.2 m/s^3)*t^2. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s^2. It then travels with constant speed it has achieved for another 10 s. Your average speed over the 12 km drive will be less than 70 km/h A car starting from rest accelerates at a constant 2.0 m/s^2 for 10 s. You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Which one of the following statements about this rock while it is in the air is correct? The acceleration is downward at all points in the motion. During the time that both objects continue to fall, their separation increases A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground? T Two objects are dropped from a bridge, an interval of 1.0 seconds apart. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock? a A 10-kg rock and a 20-kg rock are dropped from the same height and experience no significant air resistance. A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.
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