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Andrei [34K]
2 years ago
6

A 2000 kg car has a 40000 J of kinetic energy. How fast is it moving?

Physics
1 answer:
Lera25 [3.4K]2 years ago
5 0

Answer:

6.32 m/s

Explanation:

KE = 1/2 m v^2

sqrt (2 * KE /m) = v = 6.32 m/s    

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A train moves from rest to a speed of 25 m/s in 30.0 seconds. What is the acceleration?
fredd [130]

Answer:

a = 0.83\ m/s^2

Explanation:

<u>Uniform Acceleration </u>

When an object changes its velocity at the same rate, the acceleration is constant.

The relation between the initial and final speeds is:

v_f=v_o+a.t

Where:

vf  = Final speed

vo = Initial speed

a   = Constant acceleration

t   = Elapsed time

It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.

Solving for a:

\displaystyle a=\frac{v_f-v_o}{t}

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