A 4 kg body moves at 5 m/s. Its KE is:

A 2 kg body is lifted 10 m. The increase in PE is: (g = 10 m/s^2)

A 5 kg block at 8 m/s slides on a rough surface (mu_k = 0.4). Distance before stopping: (g = 10 m/s^2)

A 1 kg block at 4 m/s compresses a spring (k = 100 N/m) on a smooth surface. Max compression: <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 340 110" style="max-width:340px;margin:0.5em auto;display:block;"> <title>Block compressing a spring</title> <rect width="340" height="110" fill="#faf9f5" rx="6"/> <defs><marker id="ah-q31-03" markerWidth="8" markerHeight="6" refX="8" refY="3" orient="auto"><polygon points="0 0, 8 3, 0 6" fill="#c6613f"/></marker></defs> <rect x="280" y="15" width="8" height="80" fill="#e8e0d4" stroke="#14140f" stroke-width="1.5"/> <line x1="20" y1="75" x2="290" y2="75" stroke="#14140f" stroke-width="1.5"/> <rect x="80" y="40" width="40" height="35" fill="#f0e8e0" stroke="#14140f" stroke-width="1.5" rx="2"/> <text x="100" y="63" text-anchor="middle" font-size="10" font-family="sans-serif" fill="#14140f">1kg</text> <line x1="60" y1="57" x2="30" y2="57" stroke="#c6613f" stroke-width="2" marker-end="url(#ah-q31-03)"/> <text x="25" y="50" font-size="9" font-family="sans-serif" fill="#c6613f">4 m/s &#8594;</text> <path d="M125,55 L135,55 L140,40 L150,70 L160,40 L170,70 L180,40 L190,70 L195,55 L280,55" fill="none" stroke="#14140f" stroke-width="1.5"/> <text x="200" y="95" font-size="10" font-family="sans-serif" fill="#14140f">k = 100 N/m</text> <text x="50" y="95" font-size="10" font-family="sans-serif" fill="#788c5d">x_max = ?</text> </svg>

A force of 10 N moves a body 5 m at 60 degrees to the force. Work done is: