Answer:
d. 500 m/s
Explanation:
Momentum: This is the product of the mass of a body to its velocity, The S.I unit of momentum is kgm/s.
Mathematically, momentum can be expressed as,
M = mv....................... equation 1
Where M = momentum, m = mass, v = velocity
deduced from the question,
Momentum of the car = momentum of the barrier.
MV = mv ............................. Equation 1
Where M = mass of the car, V = velocity of the car, m = mass of the barrier, v = velocity of the barrier.
making v the subject of the equation,
v = MV/m........................ Equation 2
Given: M = 1000 kg, V = 10 m/s, m = 20 kg.
Substitute into equation 2
v = 1000(10)/20
v = 500 m/s.
Hence the speed of the barrier = 500 m/s
The right option is d. 500 m/s
