An 8.0-g bullet is shot into a 4.0-kg block, at rest on a fr…

An 8.0-g bullet is shot into a 4.0-kg block, at rest on a frictionless horizontal surface (see the figure). The bullet remains lodged in the block. The block moves into an ideal massless spring and compresses it by 8.7 cm. The spring constant of the spring is 2400 N/m. qq.jpg What is the initial velocity of the bullet/block system, when the block and the system move with same velocity  ( the initial velocity of the block with captured bullet)?

A block rests on an inclined as shown in figure, angle of th…

A block rests on an inclined as shown in figure, angle of the slope is θ. The Force F is applied so that the block just starts (barely) moving upward. Answer the following Question. A1 and A2 as well as F1 and F2 are the component of Force A and Force F.  Q PIC.png If, the Applied Force is 244.3 N, the mass of the block is 5 kg, the coefficient of static friction of the surface is 0.8, what is the slope?