Question

Rita takes 20 minutes to cover a distance of 3.2Km on a bicycle. Calculate her velocity in units of km/min, m/min, and km/hr

Answer 1

for km/min,
velocity=displacement/time
=3.2/20
=0.16km/min
for m/min
velocity=3.2×1000/20
=160m/min
for km/h=3.2×20/60
1.6km/h

Answer 2

Concept:

• One dimensional motion
• Kinematic equations
• Conversion of units
• Velocity is the rate of displacement

Given:

• Distance covered by Rita D = 3.2 km = 3200 m
• Time taken to cover the given distance t = 20 mins = 1200 s = 1/3 hr

Find:

• The velocity in terms of km/min, m/min and km/hr

Solution:

Speed is the distance covered per unit of time.

Speed = distance/time

Speed = 3.2 km/ 20 min = 0.16 km/ min

Speed = 3200 m/ 20 min = 160 m / min

Speed = 3.2 km / (1/3) hr = 9.6 km/ hr

The velocity of Rita is 0.16 km/ min = 160 m/min, 9.6 km/hr.

#SPJ2