A car slows down uniformly from a speed of 18.0 m/s to rest in 5.00 s. How far did it travel in that time?
What will be an ideal response?
Answer:
Applying v = u+ at where u is initial velocity and v is final velocity, a is acceleration and t is time.
Hence acceleration is -18/5 = -3.6 m/sec^2.
Now v^2 - u^2 = 2aS
Hence S = u^2/2a = 324/7.2 = 45 meters.
You might also like to view...
To "spear" a red fish with a red laser beam and compensate for refraction, aim your laser
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
A. 83% B. 65% C. 43% D. 90% E. 56%
A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The average force on the post is
A) 2500 N. B) 25,000 N. C) 250,000 N. D) 2,500,000 N.
With respect to the earth, object 1 is moving at speed 0.90 c to the right. Object 2 is moving to the left at speed 0.70 c with respect to object 1. How fast is object 2 moving with respect to the earth?
A) 0.12 c B) -0.20 c C) 0.54 c D) 0.20 c E) 1.6 c