First you find the final velocity which is the velocity when the ball hots the ground: v^2 = v0^2 + 2ad. We know acceleration is -9.8 and d is -30 and v0 is 0 so all we do is plug everything to find v ===> v= 24.25
Now we find momentum which is mv so momentum is 2 times the velocity
Momentum = 48.5 kg-m/s
Answer:
48.54kgm/s
Explanation:
Momentum is defined as the product of mass and velocity of an object. Mathematically,
Momentum = Mass×velocity
Given mass = 2kg
Velocity of the body as it strikes the ground can be gotten using the equation of motion v² = u²+2as where;
v = final velocity of the body
u = initial velocity of the body = 0m/s
a = g = acceleration due to gravity
S = h = height covered by the rock
The equation will then become
v²= u²+2gh
v² = 0²+2(9.82)(30)
v² = 589.2
v = √589.2
v = 24.27m/s
the momentum of the ball at the time that it strikes the ground = mass × velocity
= 2×24.27
= 48.54kgm/s
