a body A of mass 3 kg and a body B of mass 10 kg are dropped simultaneously from a - Physics - More about Energy

Question

a body A of mass 3 kg and a body B of mass 10 kg are dropped
simultaneously from a height of 14 9 m calculate:
(A) their momenta
(B) their potential energy
(C) their kinetic energy
when they are 10 m above the ground

Vara · Accepted Answer

Velocity of A at the height of 10 m:v1=2gh1-h2    =2×9
8×14 9-10    =9
8 m/sVelocity of B at the height of 10 m:v2=2gh1-h2    =2×9
8×14 9-10    =9
8 m/s(a)Momentum of A:P1=m1v1     =3×9
8      =29 4 kg
m/sMomentum of B:P2=m2v2     =10×9
8      =98 kg
m/s(b)Potential energy of A:PEA=m1gh2         =3×9
8×10           =294 JPotential energy of B:PEB=m2gh2         =10×9
8×10           =980 J(c)Kinetic energy of A:KE1=12m1v12        =12×3×9
82          =144
1 JKinetic energy of B:KE2=12m2v22        =12×10×9
82          =480
2 J

a body A of mass 3 kg and a body B of mass 10 kg are dropped simultaneously from a height of 14.9 m .calculate:(A) their momenta(B) their potential energy(C) their kinetic energywhen they are 10 m above the ground.

a body A of mass 3 kg and a body B of mass 10 kg are dropped simultaneously from a height of 14.9 m .calculate:
(A) their momenta
(B) their potential energy
(C) their kinetic energy
when they are 10 m above the ground.