Question

117. The radius of the wheel of a vehicle
is 70 cm. the wheel makes 10 revolutions
in 5 seconds. The speed of the vehicle is
a) 29.46 km/hr
b) 31.68 km/hr
c) 36.25 km/hr
d) 32.72 km/hr​

Answer 1

Answer:

Answer: Option B

Solution

Distance covered in 5 sec :

=(2×227×70×10)cm=4400cm=44m

Distance covered in 1 sec :

=(445)m=8.8m

∴ Speed :

=8.8m/sec=(8.8×185)km/hr=31.68km/hr