A car travelling at 36 km/h speeds up to 72 km/h in 5 seconds. What is its acceleration? If the same car stops in 20 seconds, what is the retardation?
u = 36 km/hr = 36 * (5/18) = 10 m/sv = 72 km/hr = 20 m/sUsing Newton's first eqn. of motion :v = u + at20 = 10 + a(5)Hence a = 2 m/s²Now the car stops in 20 seconds :Using the same equation :v = 0u = 20 m/st = 20 seca = ?0 = 20 + a (20)a = -1 m/s²In 2nd case there is retardation of 1 m/s²
A car travelling at 18km/h speeds up to 54 km/h in 5 seconds. What is its acceleration?
Acceleration is usually expressed in m/s^2. It also makes the units easy to handle, ergo;In this case the Δv is 36 km/h = 10 m/sa = Δv / Δt = 10 m/s / 5 s2 m/s^2Just as Anil Singh answered below.I can recommend Khan Academy for brushing up the basics or help studying more advanced math and physics, they not only explain each concept in easy steps, there’s also interactive study tools and easy tests to check your understanding as you go. It’s a good addition to any course books, but not a replacement.Acceleration and velocity
A car is traveling at 60 km/hr it accelerates to 85 km/ hr in 5 seconds what is the acceleration of the car?
Using the equation “v = u + at”, where ‘v’ is the final velocity of the car, ‘u’ is the initial velocity of the car, ‘a’ is the acceleration of the car, and ‘t’ is the time the car undergoes the acceleration for.Hence, we get:85 = 60 + 5a25 = 5a5 = aTherefore, the car accelerated at a rate of 5 kilometres per hour per second.To get this in m/s^2, we multiply the above answer by 1000 and divide it by 3600 (60 * 60), this gives us:a = 1.39 m/s^2
How to convert km/h to m/s? What is the distance traveled by a car in 1 second at 72 km/h?
Everytime that you need to convert a value given in kmph (kilometer per hour) to m/s (meters per second), there is a very easy way to do this.To convert a value in kmph to m/s, multiply it by 5/18.To convert a value given in m/s to kmph, multiply it by 18/5.So, if the car is going at 72kmph, then its speed in m/s will be 72 x 5/18 = 20 m/s.Thus, the car travels 20 meters in one second.Similarly, if the car is travelling at 90kmph, then converting it to m/s : 90 x 5/18 = 25m/s.Hope my answer helps.Cheers!Ps: Thank you Shruti Kumari for A2A
A car travelling with a velocity of 80 km/h slowed down to 44 km/h. What is the retardation?
V = u + atv final velocity 44u initial velocity 80a acceleration ??t time ??considering time as 1 houra = (44 - 80) / 1 = -36.So acceleration is -36 km/hour^2 or you can say retardation is 36 km/hour^2
A car is travelling at 36km/hr speed up to 72km/hr in 5 seconds. What is the acceleration?
2 m/s/s
A body moving at 36 km/h is accelerated uniformly to attain a speed of 108 km/h in 16 seconds. What is its acceleration in meters per second squared?
simply convert km/hr into m/s36 km/hr=36*5/18 = 10 m/s108 km/hr=108*5/18 = 30 m/snow[math] [/math]a = change in velocity/time takena = 30–10/16a = 20/16 = 5/4 m/s^2a = 1.25 m/s^2
The final velocity of a motorist after accelerating a distance of 100 m is 72km/hr. What would be its velocity 5 seconds before reaching 72km/hr?
Assuming initial velocity u=0,v=u+at v=at 20=ats=0.5at*t 100=10t t=10 secondsat=20 a=2m/s²v=at t=5Therefore v=10m/s or 36 kmph