Answer:
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).
Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. ... Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.
In physics and astronomy, a frame of reference consists of an abstract coordinate system whose origin, orientation, and scale are specified by a set of reference points ― geometric points whose position is identified both mathematically and physically.
Answer:
The acceleration of the skateboard is -9.65 m/s².
Explanation:
Given that,
Mass of teenager = 72 kg
Force 
Mass of skateboard = 2.8 kg
Suppose, the determine the numerical value for the magnitude of the acceleration of skateboard
We need to calculate the acceleration of skateboard
Using balance equation
Put the value into the formula
Hence, The acceleration of the skateboard is -9.65 m/s².
The components are the sides S and W of a right triangle with SW = 5 km as the hypotenuse. It helps to sketch out these types problems.
Using the 60°south of west angle would make W adjacent and S opposite to the angle. using SOH CAH TOA
sin(60) = S/5
5*sin(60) = S
5*√(3)/2 = S
4.3 km = S
Explanation:
formula: Vi = Vf - (at)
Vi: intial velocity
Vf: final velocity
a: acceleration
t: time
fill in formula with the numbers you are given
Vi= 41.6m - ((9.81 m/s^2)(1.89s))
parenthesis first according to pemdas
Vi= 41.6m - 18.54m/s
Answer: 23.06m/s
disclaimer: I havent done physics in awhile so I have no idea if this is right. just an attempt to help steer you in the right direction hopefully. good luck
