At a certain time a particle had a velocity of 18 m/s in the positive x-direction, and 2.4 s later its velocity was 30 m/s in the opposite direction. What is the average acceleration of the particle during this 2.4 s interval.

A particle has an acceleration of + 6.24 m/s2 for 0.300 s. At the end of this time the particle’s velocity is + 9.31 m/s. (a) Write given quantities.  (b) Calculate the particle’s initial velocity.

An express train passes through a station. It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150 m/s² as it goes through. The station in 210.0 m long. How fast is it going when the nose leaves the station?

The function x (t) = -2.1le-1.93t describes the position, in meters, of a particle on the x-axis as a function of time t, in seconds. Find the particle's velocity at time t = 3.05 s.

A ball of moist clay falls 17.7 m to the ground. It is in contact with the ground for 21.0 ms before stopping. (a) What is the average acceleration of the ball during the time it is in contact with the ground? (Treat the ball as a particle.) (b) Is the average acceleration up or down?

A particle moves in one dimension, and its position as a function of time is given by x (2.0 m/s)t + (-3.6 m/s²)e². (a) What is the particle's average velocity from t 0.45 s to t = 0.55 s? (Indicate the direction with the sign of your answer.) m/s (b) What is the particle's average velocity from t = 0.49 s to t = 0.51 s? (Indicate the direction with the sign of your answer.) m/s MacBook Air 888 F1 F2 F3 F4 F5 F6 @ #3 $4 3 4 Q W E R T G

A particle is initially traveling east at 5 m/s , then it begins to have an acceleration of 10 m/s2 in the north direction. What can you say about its velocity after a long period of time.

Part (a)  What is the velocity, in meters per second, of the particle at the time t1 = 3.0 s?  v(t) = ______ m/s Part (b)  What is the velocity, in meters per second, of the particle when it is at the origin (x = 0) at time t0 > 0? v(t0) = ______ m/s

Your motion begins at rest and consists of acceleration at 2.0 m/s^2 for 10 seconds, then a period of7.5 seconds with no acceleration, then deceleration at -1.0 m/s^2 for 20 seconds, resulting in a finalspeed of zero. The total distance traveled is 450 m. What is your average speed during this motion? Group of answer choices 10 m/s 42 m/s 12 m/s 16 m/s zero

A driver applies the brakes on his car reducing its speed from 31.0 m/s to 11.0 m/s in a time 5.0 secs while traveling a distance of 121 m. What is that magnitude of the car's average acceleration during the 5.0 sec period?