JEE Main Physics question
A car is moving with a speed of 100 km h⁻¹. If the mass of the car is 950 kg, then its kinetic energy is
Answer: (A)
Solution
v = 100 km/h = 100×5/18 ms⁻¹ ≈ 27.78 ms⁻¹. KE = ½(950)(27.78²) ≈ 3.666×10⁵ J ≈ 0.367 MJ.
A car is moving with a speed of 100 km h⁻¹. If the mass of the car is 950 kg, then its kinetic energy is
v = 100 km/h = 100×5/18 ms⁻¹ ≈ 27.78 ms⁻¹. KE = ½(950)(27.78²) ≈ 3.666×10⁵ J ≈ 0.367 MJ.