contestada

Which equation can be used to solve for the magnitude of the velocity (v) at which Frances slides backwards after giving the curling stone a push in Test 3?

A
0 = –(45 kg • v) + (20 kg • 3 m/s)

B
0 = –[(45 kg + 20 kg) • v]

C
60 kg • m/s2 = (45 kg • v) + (20 kg • 3 m/s)

D
195 kg • m/s2 = (45 kg + 20 kg) • v

Which equation can be used to solve for the magnitude of the velocity v at which Frances slides backwards after giving the curling stone a push in Test 3 A 0 45 class=

Respuesta :

unicornetfairies

A

A 0 = –(45 kg • v) + (20 kg • 3 m/s)

Not moving, means momentum is zero. Thus, momentum after = momentum before (& that momentum is zero)

V = 4/3m/s

(-45 x 4/3) + (20x3) = 0

Solving to find v :

0. = –(45 kg • v) + (20 kg • 3 m/s)

= - (45 kg • v) + 60

-60

-60 = - 45 x v

÷ — 45

4/3 = v

(4/3 = 1.33333333333)

Hope this helps!