Rectilinear Motion Problems And Solutions Mathalino Apr 2026

Use ( v = v_0 + at ): [ 0 = 20 - 9.81 t \quad \Rightarrow \quad t = \frac209.81 \approx \boxed2.038 , \texts ]

From ( v = \fracdsdt = 20 - 0.5s ). Separate variables:

We know ( v = \fracdsdt = 3t^2 ). Integrate:

Ground: ( s = 0 ). Use ( v^2 = v_0^2 + 2a(s - s_0) ): [ v^2 = 20^2 + 2(-9.81)(0 - 50) ] [ v^2 = 400 + 981 = 1381 ] [ v = -\sqrt1381 \quad (\textnegative because downward) ] [ \boxedv \approx -37.16 , \textm/s ] rectilinear motion problems and solutions mathalino

[ \int dv = \int 6t , dt ] [ v = 3t^2 + C_1 ]

Use ( a = v \fracdvds = -0.5v ). Cancel ( v ) (assuming ( v \neq 0 )):

[ \int ds = \int 3t^2 , dt ] [ s = t^3 + C_2 ] Use ( v = v_0 + at ): [ 0 = 20 - 9

[ v = v_0 + at ] [ s = s_0 + v_0 t + \frac12 a t^2 ] [ v^2 = v_0^2 + 2a(s - s_0) ]

[ \fracdvv = -0.5 , dt ] Integrate: [ \ln v = -0.5t + C ] At ( t=0, v=20 \Rightarrow \ln 20 = C ). [ \ln\left( \fracv20 \right) = -0.5t ] [ \boxedv(t) = 20e^-0.5t ]

[ v , dv = 4s , ds ] Integrate: [ \fracv^22 = 2s^2 + C ] At ( s = 1 ) m, ( v = 0 ): [ 0 = 2(1)^2 + C \quad \Rightarrow \quad C = -2 ] Thus: [ \fracv^22 = 2s^2 - 2 ] [ v^2 = 4s^2 - 4 ] [ \boxedv(s) = \pm 2\sqrts^2 - 1 ] Use ( v^2 = v_0^2 + 2a(s - s_0) ): [ v^2 = 20^2 + 2(-9

Topics: Dynamics, Engineering Mechanics, Calculus-Based Kinematics What is Rectilinear Motion? Rectilinear motion refers to the movement of a particle along a straight line. In engineering mechanics, this is the simplest form of motion. The position of the particle is described by its coordinate ( s ) (often measured in meters or feet) along the line from a fixed origin.

Since the particle moves to increasing ( s ) from rest at ( s=1 ), take positive root.

At ( t = 0 ), ( s = 0 \Rightarrow C_2 = 0 ). Thus: [ \boxeds(t) = t^3 ]