physics college
posted by meera .
An antelope moving with constant acceleration covers the distance between two points 70.0
m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first
point? (b) What is its acceleration?
A car is stopped at a traffic light. It then travels along a straight road so that its distance from
the light is given by x(t) = bt2 – ct3, where b = 2.40m/s2 and c = 0.120m/s3. (a) Calculate the average
velocity of the car for the time interval t = 0 to t = 10.0 s. (b) Calculate the instantaneous velocity of the
car at t = 0, t = 5.0 s, and t = 10.0 s. (c) How long after starting from rest is the car again at rest?

ONe question per post, please. I helps you to put down what you think needs to be done, or what you have tried, that way, we can see where your thinking is going askew, and correct that.
avg velocity= (Vf+Vi)/2=distance/time
solve for Vi
Vf=Vi+at solve for a 
Water flows (velocity initial=0) over a dam at the rate of 660 kg/s and falls vertically 81 m before striking the turbine blades. Calculate the rate at which mechanical energy is transfered to the turbine blades, assuming 55% efficiency.
Respond to this Question
Similar Questions

Physics
A car moving with a constant acceleration covers the distance between two points 60 m apart in 6.0 s. Its velocity as it passes the second point is 17 m/s. a) What was the speed at the first point? 
physics i suck
an antelope moving with constant acceleration covers the distance between two points that are 80 meters apart in 7 seconds. Its velocity as it passes the second point is 15 meters per second. What is the antelope's velocity at the … 
General Physics I
An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? 
physics
A car moving with a constant acceleration covers the distance between two points 80 m apart in 8.0 s. Its velocity as it passes the second point is 14 m/s. (a) What was the speed at the first point? 
physics
A car moving with a constant acceleration covers the distance between two points 80 m apart in 8.0 s. Its velocity as it passes the second point is 15 m/s. (a) What was the speed at the first point? 
physics
An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? 
physics
a car moving with constant acceleration covers a distance between two points 180m apart in 6 sec.its speed as it passes the second point in 45m/s. what is its acceleration and its speed at the first point? 
Physics
An antelope moving with constant acceleration covers the distance between two points 75.0 m apart in 6.20 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? 
chaitanya
A car moving with constant acceleration covers the distance between two points 180m apart in 6sec.its speed as it passes the second point is 45m/s.what is its acceleration and its speed at the first point. 
physics
an antelope moving with constant acceleration covers the distance between two points 70.0m apart in 7.00 s.Its speed as it passes the second points is 15.0m/s. a.What is its speed at the fist poin?