Search
Ask a question
0

A skier moving 6.0m/s forward begins to slow down, accelerating at -2.0m/s^2 for 1.5s. What is the skier's velocity at the end of the 1.5s?

Here's what I did but I don't know another way of solving this without using point slope form.

(0, 6)

(1.5, y)

y-y1=m(x-x1)

y-6=-2(1.5-0)

y-6= -3

y=3m/s

velocity =3m/s forward

4 Answers by Expert Tutors

Tutors, sign in to answer this question.
Benjamin K. | Tutoring in Social Studies, Reading, or basic subjectsTutoring in Social Studies, Reading, or ...
0

The simplest way to solve this problem is by using the basic acceleration formula  V= at Where V is velocity, a is acceleration, and t= time.  This problem gives an initial velocity an acceleration and a time asking for an ending velocity.  We can find the ending velocity two different ways.  We can take the acceleration of -2m/s times the time of 1.5 seconds, and find the change in velocity of -2*1.5= -3m/s then we add the initial velocity to the change in velocity 6m/s +-3m/s = 3m/s or you can solve the equation using the slope line intercept formula.

(0, 6)

(1.5, y)

y-y1=m(x-x1)

y-6=-2(1.5-0)

y-6= -3

y=3m/s

velocity =3m/s forward

Brad M. | Professional Tutor: Ultra Streamlined Math - Physics - AccountingProfessional Tutor: Ultra Streamlined M...
4.9 4.9 (218 lesson ratings) (218)
0

You got the correct answer, Mathalina!

Physically, the constant, negative 2m/s/s acceleration means that the velocity will negate 2 m/s each second ... v= 6m/s to start ... 4m/s after 1s ... 2m/s at t=2s ... 0 at t=3s ... -2m/s (backward now) at t=4s ... -4m/s at t=5s ... much like heading uphill, slowing to a stop, then reversing downhill faster & faster  :)

Kirill Z. | Physics, math tutor with great knowledge and teaching skillsPhysics, math tutor with great knowledge...
4.9 4.9 (174 lesson ratings) (174)
0

Formulawise, v(t)=v0+a*t, where v0 is the initial velocity, t is the time elapsed. Brad explained a physical meaning of this, thanks to him.

Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
4.0 4.0 (1 lesson ratings) (1)
0

6.0m/s - (2.0m/s2)(1.5s) = 6.0m/s - 3.0m/s = 3.0m/s