Question

A particle was at rest from 1 a.m. It moved at a uniform speed 50km/hr from 1.30 a.m. to 2:00 a.m. Find the average speed between (a) 1.00 a.m. and 2.00 a.m. (b) 1.15 a.m. and 2.00 a.m. (c) 1.30 a.m. and 2.00 a.m.

Answer 1

Answer:

time when the particle was at the rest = 1 AM

uniform speed of 50 km/h = 1:30 am to 2:00 am

a)distance covered between 1:30 & 2:00 am= speed * time= 50 *1/2=25km

average speed = total distance/total time taken

= 25/1 = 25km/h

b)average speed = 25/(3/4) =33km/h

c)average speed=25/(1/2)=50km/h