The driver of a sport car pushed down the accelerator so that the engine pushes the care forward with a force of 2500N,s tarting from rest. How fast the car can go after 20s later?
I have tried this by using v=u+at but i don't have a. From F=ma, i cant get the value of a since mass is not given. Is it any mistake in this question? Please help me. The answer provided is 180km/h.
They have to tell you the mass.
To calculate the final velocity of the car after 20 seconds, we need to know the acceleration (a) of the car. Unfortunately, the given information does not provide us with the mass of the car, which is needed to calculate the acceleration using the equation F = ma.
Therefore, without the mass or any other information, it is not possible to directly calculate the final velocity of the car after 20 seconds. It seems there might be a mistake in the question or missing information needed to solve it accurately.
However, if we assume the car's mass is known, we can proceed with the calculation. Let's consider an example where the mass of the car is 1000 kg.
Given information:
Force (F) = 2500 N
Mass (m) = 1000 kg (example value)
Using the formula F = ma, we can calculate the acceleration (a):
2500 N = 1000 kg x a
a = 2.5 m/s^2
Now we can use the equation v = u + at to calculate the final velocity (v):
u = 0 m/s (starting from rest)
t = 20 s
v = 0 m/s + (2.5 m/s^2)(20 s)
v = 50 m/s
To convert this to km/h, we multiply by 3.6:
v = 50 m/s x 3.6 km/h/m
v ≈ 180 km/h
So, if we assume a car mass of 1000 kg and a constant force of 2500 N, the car would reach a final velocity of approximately 180 km/h after 20 seconds.
Please note that this calculation is based on assumptions and may not accurately represent the real-world situation. It is always important to have complete and accurate information when performing calculations.