A 4.0-kg ball has a momentum of 20.0 kg-m/s. What is the ball's speed?

Explanation:

Moving mass m = 4.0Kg

Momentum P = 20.0Kgm/s

Speed V = ?

Momentum = product of mass and its velocity

P = mV

V = P

m

V = 20

4

V = 5m/s

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j