Aperson jumps from the roof of a house 3.1-m high. when he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. if the mass of his torso (excluding legs) is 42kg .
part a
find his velocity just before his feet strike the ground.
express your answer using two significant figures. enter positive value if the velocity is upward and negative value if the velocity is downward.

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2