Home Page of Peggy E. Schweiger

## Acceleration Homework

- 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? Ans: 1.39 m/s, across the river; 18,000 sec
- If a ball is dropped and attains a velocity of 29.31 m/s in a time interval of 3 sec on another planet, what is the
*acceleration* of gravity on this planet? Ans: 9.77 m/^{2}, down
- 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? Ans: 16.66 m/s
- A runner accelerates from rest at a rate of 1.40 m/s
^{2} over a time interval of 8 sec. What is his final *velocity*? How *far* dod he travel? Ans: 11.2 m/s, down the track; 44.8 m
- A car traveling at 4 m/s, south, accelerates at 5 m/s
^{2} over a displacement of 114 m, south. What is his final *velocity*? Ans: 34 m/s, south
- 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/s
^{2}. 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? Ans: 30 sec; 1800 m; 120 m/s
- What is the acceleration of the object in the graph at these exact times: 2 sec, 5 sec; 7 sec, and 14 sec? Ans: zero; 1 m/s
^{2}; -0.67 m/s^{2}; 0.67 m/s^{2}

Acceleration Notes

Acceleration Sample Problems