Question

Identical metal blocks initially at rest are released in various environments as shown in scenarios A through D below. In all cases, the blocks are released from a height of 2 m above the ground, considered to be the level of reference in this problem. If air resistance is neglected, rank the scenarios from least kinetic energy to greatest kinetic energy at the instant before the block reaches the ground. 2 3 4 1 on A-02 frictions free call we (A) 23.14 (1) 213-4 (C) 213.4 (D) 1-2 3-4 OD ОА ОС ess OB

Answer 1

SO • mi all 4 cases, height of block above ground is same, block has Same intial gravitation potential energy in each case In 3 and 4 there are 00 resblive forces entre potential energy is converted into SO Kinetic energy K₃ = K4 friction force on block masino mgcoso fk = Hk N fk = Hk mg coso friction done by work mg Wf = - fx x h Wf - sino Hk mgh coso Wf= sino Mkongh lane as increases tano increas es SO friction will dissipates more o es small energy when K 17 K2 Answer = 27 1 < 334