A) A child on a swing is pulled back by Daddy and released from rest at a height

Question

A) A child on a swing is pulled back by Daddy and released from rest at a height of 0.93 m above the swing’s lowest point. Find the child’s speed as the swing passes through its lowest point. ___ m/s
B) Two hockey pucks of equal mass approach each other head-on with equal speeds of 8.4 m/s. They collide and one puck leaves the collision with a speed of 6.4 m/s. What is the speed of the other puck after the collision? ____ m/s A) A child on a swing is pulled back by Daddy and released from rest at a height of 0.93 m above the swing’s lowest point. Find the child’s speed as the swing passes through its lowest point. ___ m/s
B) Two hockey pucks of equal mass approach each other head-on with equal speeds of 8.4 m/s. They collide and one puck leaves the collision with a speed of 6.4 m/s. What is the speed of the other puck after the collision? ____ m/s

Explanation / Answer

A)

From conservation of energy:

K2-K1=U1-U2

K2-0=mg(y1-y2)

1/2*m*v2= mg(y1-y2)

V=(2g(y1-y2)) = (2×9.8×0.93) = 4.26 m/s

B)

m1u1+m2u2= m1v1+m2v2

m1=m2

u1+u2=v1+v2

8.4-8.4= 6.4 + v2

v2 = -6.4 m/s

that is second one moves with 6.4 m/s in opposite to first one after collision

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