A 70 kg base runner begins his slide into second base when moving at a speed of

Question

A 70 kg base runner begins his slide into second base when moving at a speed of 4.0 m/s. The coefficient of kinetic friction between his body and the ground is 0.70. How much total energy is lost during the entire slide? 560 J 140 J 280 J 70.0 J 420 J A block of mass 12.5 kg slides from rest down a frictionless 30.0 degree incline and it is stopped by a strong spring with constant of 3.00 times 10^4 N/m. The block slides 3.00 m from the point of release to point where it comes to rest against the spring. How much did the spring compress? 0.11 m 0.19 m 0.05 m O.16 m 0.22 m A 2.0 kg ball has a velocity of 8.0 m/s that is pointing vertically downward just before it strikes the ground and leaves the ground with a velocity of 6.0 m/s upward. What is the change of momentum of the ball? 4.0 kg.m/s downward 4.0 kg.m/s, upward 12 kg.m/s, downward 28 kg.m/s, downward 28 kg.m/s, upward The condition necessary for the conservation of momentum of a given system is that the net external force must be zero at least one object must be at rest the conservative forces must not act on the system the work done by the non-conservative forces must be zero the internal forces must equal the external forces

Explanation / Answer

4) a
5) d
6) e
7) a

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