Question

10. An athlete completos 100 m race in 9.8 second. What
in his speed in kmh !? Assume the athlete to be
running with uniform speed. ​

Answer 1

Explanation:

$distance = 100 \: m \\ time \: = 9.8 \: sec \\ \\ speed \: = \frac{distance }{time \: } \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{100 \: m}{9.8 \: s} \times \frac{5}{18}m/s \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{1000}{98} \times \frac{5}{18} m/s \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{speed(in\: km/hr) = 2.83 \: km/ hr}$