Read the following scenario and decide if it is a hypothesis, theory or law.
2 answers:
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Answer
given,
mass of ball = 130 g = 0.13 kg
speed = 6.5 m/s
t = 9.5 ms = 0.0095 s
rebound with 42 % of initial kinetic energy
a)
v₂ = 4.212 m/s
b) impulse is equal to change in momentum
I = 1.393 kg m/s
c) Force =
=
F = 146.63 N
Answer:
Work done, W = −287500 Joules
Explanation:
It is given that,
Mass of the car, m = 920 kg
The car is travelling at a speed of, u = 90 km/h = 25 m/s
We need to find the amount of work must be done to stop this car. The final velocity of the car, v = 0
Work done is also defined as the change in kinetic energy of an object i.e.
W = −287500 Joules
Negative sign shows the work done is done is opposite direction.