A block of mass m = 4.4 kg, moving on frictionless surface with a speed $v _ { \mathrm { i } } = 9.2 \mathrm {~m} / \mathrm { s }$ makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed of $v _ { \mathrm { f } } = 2.5 \mathrm {~m} / \mathrm { s }$ What is the mass M of the second block?
A) 7.7 kg
B) 9.0 kg
C) 10 kg
D) 0 kg

Question

A block of mass m = 4.4 kg, moving on frictionless surface with a speed $v _ { \mathrm { i } } = 9.2 \mathrm {~m} / \mathrm { s }$ makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed of $v _ { \mathrm { f } } = 2.5 \mathrm {~m} / \mathrm { s }$ What is the mass M of the second block? 
A) 7.7 kg 
B) 9.0 kg 
C) 10 kg 
D) 0 kg

Quizplus · Accepted Answer

The Answer of A block of mass m = 4.4 kg, moving on frictionless surface with a speed $v _ { \mathrm { i } } = 9.2 \mathrm {~m} / \mathrm { s }$ makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed of $v _ { \mathrm { f } } = 2.5 \mathrm {~m} / \mathrm { s }$ What is the mass M of the second block? 
A) 7.7 kg 
B) 9.0 kg 
C) 10 kg 
D) 0 kg

A Block of Mass M = 4 vi=9.2 m/sv _ { \mathrm { i } } = 9.2 \mathrm {~m} / \mathrm { s }vi​=9.2 m/s

A Block of Mass M = 4 $v _ { \mathrm { i } } = 9.2 \mathrm {~m} / \mathrm { s }$