Một vật nặng treo một lò xo giãn ra 0.8cm. lấy g=10m/s2 chu kì dao động của vật là

Could someone . i have tried to solve myself but my calculation is off

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground