Question

A car of mass 1000kg moving with a velocity of 36 km/h hits a wall and comes to rest in 5 s. Basing upon the above information which of the following is / are correct *

1 point

F=2000N

F=-2000N

u=10m/s

a=-2m/s2

t=5sec

a=2 m/s2

u=36km/h​

Answer 1

Answer:

u=10m/s

t=5sec

u=36km/hr

Answer 2

Given :

Mass of the car = 1000 kg

Initial velocity of the car = 36 km/h = 10 m/s

Time taken by the car to stop = 5 seconds

To find :

The correct statements regarding the data of the question .

Solution :

Initial velocity , u = 36 km/h = 10m/s

Time , t = 5 sec

Acceleration , a = ( 0 - 10 ) / 5

=> a = -2 m/$s^2$

Force , F = 1000 * ( -2 )

=> F = -2000 N

The correct statements regarding the data of the question are :

(i) F = -2000 N

(ii) u = 10 m/s = 36 km/h

(iii) a =  -2 m/$s^2$

(iv) t = 5 sec