Class 10 > Science

Question

(a) Convert a speed of 54 km/hr into m/s. (b) Change the speed of 6 m/s into km/hr. (c) A driver decreases the speed of a car from 25 m/s to 10 m/s in 5 seconds. Find the acceleration of car.
Hard

Solution

(a)Formula: divide the speed value by 3.6 = 54/3.6 54 kilometres per hour = 15 metres per second = 15 m/s b)Formula: multiply the speed value by 3.6 = 6x3.6 6 metres per second = 21.6 kilometres per hour = 21.6 km/hr (c)Initial velocity, = 25 m/s Final velocity, = 10 m/s Time taken, = 5s Acceleration= v-u/t= 10-25/5 = -15/5= -3m/s²

Was this answer helpful? 0 0