Answer:
(d). 1.1 × 10⁵ cal.
Explanation:
Kinetic Energy of a body: This is the energy of a body i motion. It is measured in Joules.
It can be expressed mathematically as
Ke = 1/2mv²................................... equation 1
Where ke = kinetic energy, m = mass in kg, v = velocity in m/s.
Where m = 1000 kg, v = 30m/s.
Substiting these values into equation 1,
Ke = 1/2(1000)(30)²
Ke = 500 × 900 = 450000 J
If 1 cal = 4.186 J
4.186 J = 1 cal
450000 J = (450000 × 1)/4.186 cal
= 107501.2 cal. = 1.075 × 10⁵ cal
The Kinetic Energy is ≈ 1.1 × 10⁵ cal.
The right option is (d) 1.1 × 10⁵ cal.
