- #1
amritha_sish
- 5
- 0
1. A ball is thrown vertically upwards with a velocity of 49m/s. Calculate
a) The maximum height to which it rises
b) The total time it takes to return to the surface of the earth.
2. A certain force exerted for 1.2 seconds increases the speed of an object
from 1.8m/s to 4.2m/s. Later the same force is applied for 2 seconds. How
much does the speed change in 2 seconds?
3. A motorboat starting from rest on a lake accelerates in a straight line
at a constant rate of three metres per second square for 8 seconds. How
far does the boat travel during this time?
4. a) Why are double tyres provided at the rear wheels of a truck?
b) A man at the top of a tower throws an object horizontally
whereas he simply drops another. Will these two objects reach
the Earth at the same time? Why?
c) Explain why a dead body floats, with its head immersed in
water?
a) The maximum height to which it rises
b) The total time it takes to return to the surface of the earth.
2. A certain force exerted for 1.2 seconds increases the speed of an object
from 1.8m/s to 4.2m/s. Later the same force is applied for 2 seconds. How
much does the speed change in 2 seconds?
3. A motorboat starting from rest on a lake accelerates in a straight line
at a constant rate of three metres per second square for 8 seconds. How
far does the boat travel during this time?
4. a) Why are double tyres provided at the rear wheels of a truck?
b) A man at the top of a tower throws an object horizontally
whereas he simply drops another. Will these two objects reach
the Earth at the same time? Why?
c) Explain why a dead body floats, with its head immersed in
water?