Question

A body X of mass 500g moving with a speed of 20m/s collides with a body Y of mass 200g moving in the same direction with a speed of 10m/s.Given that the speed of the body Y after the impact is 25m/s,calculate the speed of body X

Answer 1

1). (body x) m1=500g. =0.5kg
( " " ) u1=20 m/s
( " " ) v1=?
2). ((body y) m2=200g. =0.2kg
( " " ) u2=10 m/s
( " " ) v2 =25m/s

3). m1u1+m1v1 = m2u2 + m2v2
0.5×20 + 0.5v1 = 0.2×10 + 0.2×25
10 + 0.5v1 = 2 + 5
0.5v1 = 7 - 10
v1 = -3÷0.5
v1 = -6m/s. answer