Home
Class 12
PHYSICS
In an accident, a car falls into a valle...

In an accident, a car falls into a valley and reach to the ground in 0.5 s (given g=`9.8m//s^(2))` .Find the average speed during the 0.5 s.

A

2.45 m/s

B

1.25 m/s

C

2.8 m/s

D

Can't determined

Text Solution

Verified by Experts

The correct Answer is:
A
Given ,t =0.5s
Initial velocity u=0m/s
Acceleration due to gravity , g`=10m//s^(2)`
Acceleration of the car , `a=9.8m//s^(2)`
`thereforev=4+"at"`
`rArrv=0+9.8xx0.5=4.9m//s`
Now , average speed `=(u+v)/(2)=(0+4.5)//2=2.45m//s`
Promotional Banner

Similar Questions

Explore conceptually related problems

In an accident, a car falls into a valley and reach to the ground in 0.5 s (given g = 9.8 m//s^2 ). Find the average speed during the 0.5 s.

A car falls off a ledge and drops to the ground in 0.7 s. (let g= 10ms^(2) ) What is its speed on striking the ground?

A ball falls of a table and reaches the ground in 10 s. Assuming g=10m//s^(2) , calculate its speed on reaching the ground and the height of the table.

The distance travelled by a particle in time t is given by s = (2.5 t^(2)) m. Find (a) the average speed of the partion during time 0 to 0.5 s and (b) the instantaneous speed at t = 5.0s.

The distance travelled by a particle in time t is given by s=(2.5m/s^2)t^2 . Find a. the average speed of the particle during the time 0 5.0 s, and b. the instantaneous speed ast t=5.0 is

A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m//s^(2) , calculate its speed on reaching the ground (2 marks) and the height of the table.

A car falls off a ledge and drops to the ground in 0.5 s . let g=10 m//s^(2) (for simplifyng the calculation). (i) what is its speed on striking the ground ? what is its average speed during 0.5s? (iii) How high is the ledge from the ground ?