Force from Speed & Distance — NTSE Physics in 59 Sec ⚡
❓ Question A vehicle starting from rest attains a speed of 72 km/h after covering a distance of 100 m . If the mass of the vehicle is 500 kg , find the force exerted by the vehicle . 🖼️ Concept Image ✍️ Short Solution This is a pure kinematics + Newton’s second law question. No tricks, no time calculation — just v² = u² + 2as and F = ma 💯 🔹 Step 1 — Convert Speed into SI Units (MOST IMPORTANT 💯) Given speed is in km/h , but formulas need m/s . 72 km/h = 20 m/s 📌 NTSE aur school exams mein yahin sabse zyada silly mistakes hoti hain. 🔹 Step 2 — Write Known Values Clearly Initial speed: u = 0 (starting from rest) u = 0 \quad \text{(starting from rest)} Final speed: v = 20 m/s v = 20 \text{ m/s} Distance covered: s = 100 m s = 100 \text{ m} Mass of vehicle: m = 500 kg m = 500 \text{ kg} 🔹 Step 3 — Use Equation of Motion Since u, v, s are given, use: v 2 = u 2 + 2 a s v^2 = u^2 + 2as Substitute values: ( 20 ) ...