2Acceleration1. A girl can row a boat at a speed of 5 km/h in still water. The girl heads across a river that is 25 km wide. What is the boat's velocity in m/s? How long will it take her to cross the river?
3Acceleration2. If a ball is dropped and attains a velocity of m/s in a time interval of 3 sec on another planet, what is the acceleration of gravity on this planet?
4Acceleration3. A large rock is dropped from a bridge into the river below. If the time required for it to drop is 1.7 sec, with what speed does it hit the water?
5Acceleration4. A runner accelerates from rest at a rate of 1.40 m/s2 over a time interval of 8 sec. What is his final velocity? How far did he travel?
6Acceleration5. A car traveling at 4 m/s, south, accelerates at 5 m/s2 over a displacement of 114 m, south. What is his final velocity?
7Acceleration6. A woman on a motorcycle moving uniformly at a rate of 60 m/s passes a truck at rest. At the instant the motorcycle passes the truck, the truck begins to accelerate at the rate of 4 m/s2. How long does it take the truck to catch up to the motorcycle? How far has the motorcycle traveled? What is the truck's speed at this point?
8Acceleration7. What is the acceleration of the object in the graph at these exact times: 2 sec, 5 sec; 7 sec, and 14 sec?
9Acceleration8. Which has the greater acceleration: a car that increases it speed from 50 to 60 km/h, or a bike that goes from 0 to 10km/h in the same time? Explain
10Acceleration9. An object with an initial velocity of 4 m/s moves along a straight axis under constant acceleration. Three seconds later, its velocity is 14 m/s. How far did it travel during this time.
11Acceleration10. A car that’s initially traveling 10 m/s accelerates uniformly for 4 seconds at a rate of 2 m/s2, in a straight line. How far does the car travel during this time?
12Acceleration11. A rock is dropped off a cliff that’s 80 m high. If it strikes the ground with an impact velocity of 40 m/s, what acceleration did it experience during its descent?