Aboy of mass 45 kg jumps off a wall 1.7m high.
he experiences a uniform acceleration of - 9.8 m/s^2when
his feet strike the ground, the rest of his body comes to
rest 0.12 s after.
a) calculate the time taken for the boy's feet to reach the
ground and the velocity with which his feet land.
b) calculate the force, impulse and change of momentum that
he experiences.
() find his stopping distance and say what this distance
physically represents. (assume that the ground is hand and
unyielding.
d) find the gravitational potential energy of the boy on the
wall and the kinetic energy just before he lands on the
ground.