Question 1
A stone is thrown vertically upwards with a initial speed of 10 m/s from the edge of the roof of the house of Height H=20 m
a) how long does it takes for the stone to hit the ground
b) At what velocity it will hit the ground
Solution
t=3.28 sec
v=-22.2 m/s
Question 2
A body fell from rest from a height H above the ground. In the last 1 sec of the its fall, it travelled a distance H/2 . Find the value of H
Solution
H=57.1 m
Question 3
If the body loses half of its velocity on penetrating 3 cm in the wooden block,then how much will it penetrate more before coming to rest?
Solution
1 cm
Question 4
A car brakes from a speed of 108 km/h to 72 km/h duing a displacement of 100m. What is its acceleration?
Solution This can be easily found using Third Kinematics equations
v2=u2+2as
a=-2.5 m/s2
Question 5
A Ball is dropped from a building of the height 90 m . Simultanously another ball is thrown up with a speed of 40 m/s. Calculate the Relative speed of the balls as a function of time?
Solution
Both the balls are falling freely under gravity .Therefore no acceleration of one with respect to other .So relative speed of the balls remains constant equal to 40m/s
Question 6
The Relation between t and distance x is given by
t=ax2 +bx where a and b are constant.
Expreess instaneous acceleration in terms of instaneous velocity
Solution
acceleration =-2av3
Question 7
A car travels 100 km in 2 hours and 50 km in 1 hour in the same direction.
a) What is the Car's average speed for the whole journey?
b) What is the Car's average velocity for the whole journey?
Solution
50km/h,50km/h
Question 8
Two balls of different masses (one lighter and other heavier) are thrown vertically upwards; with the same speed. Which one will pass through the point of projection in their downward direction with the greater speed?
Answers
Answer:
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