Roller Coasters
Consider a roller coaster on a section of a track that is in a straight line. It travels a distance (D). After a certain amount of time (t), D = 10t^4-t^3. Calculate the roller coaster's velocity when t = 5.
Expand Hint
Velocity is the derivative of distance.
Hint 2
The power rule for the first derivative:
$$$\frac{d}{dx}[x^n]=n\cdot x^{n-1}$$$
Velocity is a derivative of distance:
$$$v=\frac{dr}{dt}$$$
where
$$v$$
is the instantaneous velocity,
$$t$$
is time, and
$$r$$
is position.
The power rule for the first derivative:
$$$\frac{d}{dx}[x^n]=n\cdot x^{n-1}$$$
Thus,
$$$D=10t^4-t^3$$$
$$$v=(4)10t^{4-1}-3t^{3-1}=40t^3-3t^2$$$
For
$$t=5$$
, substitute "5" in the equation for time:
$$$v=40(5)^3-3(5)^2=5000-75=4,925$$$
4,925
Time Analysis
See how quickly you looked at the hint, solution, and answer. This is important for making sure you will finish the FE Exam in time.- Hint: Not clicked
- Solution: Not clicked
- Answer: Not clicked
Similar Problems from FE Sub Section: The Derivative, Derivatives
048. Derivative
051. 2nd Derivatives
078. Derivatives
158. A Train's Velocity
312. The Derivative
394. Acceleration
412. Hill Bomb
650. Differentiate
Similar Problems from FE Section: Particle Kinematics
018. A Pebble on a Mountain
030. Newton's 2nd Law
037. Motorcycle's Velocity
088. Constant Acceleration
158. A Train's Velocity
165. Velocity Plots
313. Projectile Motion
316. Jet Ski
321. Traveling Train
322. Aircraft Carrier
325. Pebble Off a Building
394. Acceleration
412. Hill Bomb
444. Electron Motion
487. G-Force
488. Block Speed
515. Initial Velocity
556. Golf Angle
635. Downhill Skiing
637. Motor Boat
658. Hockey Puck
Similar Problems from FE Section: Differential Calculus
040. Integrals
043. A Calc Question
044. Definite Integrals
048. Derivative
051. 2nd Derivatives
077. Area Under a Curve
078. Derivatives
158. A Train's Velocity
308. Definite Integral
312. The Derivative
342. Inflection Point
353. Inflections
355. Multi Roots
394. Acceleration
408. Triple Integrals
412. Hill Bomb
416. Trip Integral
430. A Curve’s Area
643. Integral Finding
650. Differentiate