**Answer:**

so initial momentum is 0.22kgm/s

**Explanation:**

m1=0.20kg

m2=0.30kg

initial velocity of m1=u1=0.50m/s

initial velocity of m2=u2=0.40m/s

total momentum of the system before collision

Pi=m1u1+m2u2

Pi=0.20kg×0.50m/s+0.30kg×0.40m/s

Pi=0.1kgm/s+0.12kgm/s

Pi=0.22kgm/s

**Answer:**

**Explanation:**

International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine standard units.

**Answer:**

3.75 seconds

**Explanation:**

Given:

y₀ = 2.00 m

y = 0 m

v₀ᵧ = 20.0 sin 60.0°

aᵧ = -9.8 m/s²

Find: t

y = y₀ + v₀ᵧ t + ½ aᵧ t²

0 = 2.00 + (20.0 sin 60.0°) t + ½ (-9.8) t²

0 = 2 + 10√3 t − 4.9 t²

Solve with quadratic method:

t = [ -10√3 ± √(300 − 4(-4.9)(2)) ] / -9.8

t = (-10√3 ± √378.4) / -9.8

t ≈ -0.218, 3.75

Since t > 0, the ball lands after approximately 3.75 seconds.

<span>The electrical potential inside a parallel-plate capacitor will increase linearly from the negative to the positive plate. If the charge is moving in the direction is naturally would move, the electric potential energy is said to decrease; if it moves in the opposite direction, it is said to increase. This is akin to lifting an object further away from the surface of the earth. As it is lifted higher, the electrical potential energy increases.</span>

**Answer:**

<em>physical quantities that cannot be defined in terms of other quantities.</em>

<em>Examples</em><em>:</em><em> </em><em>Length - meter (m)Time - second (s)Amount of substance - mole (mole)Electric current - ampere (A)Temperature - kelvin (K)Luminous intensity - candela (cd)Mass - kilogram (kg)</em>