General Physics
Course code Phys 1011
Work sheet on motion
1. An automobile travels at a rate of 25 km/hr for 4 minutes, then at 50 km/hr for 8 minutes,
and finally at 20 km/hr for 2 minutes. Find
a, the total distance in kilometer
b, the average speed for the complete trip in m/s.
2. A car traveling at 108 km/hr has its speed reduced to 36 km/hr whilst traveling over a
distance of 200m. Find the value of the retardation (assumed uniform) and the time taken.
Find also how much further the car will travel with the same retardation before coming to
rest.
3. A rocket propelled car starting from rest moves with a constant acceleration of 5m/s2 for
8sec until the fuel is exhausted. It then continues with constant velocity. What distance
does the car covers in 12 sec?
4. A stone thrown vertically upward returns to its starting point in 4 seconds. Find its initial
speed.
5. A ball is thrown downward with initial speed 8m/s from a height of 25m .find
a, the time it takes to reach the ground
b, the speed with which it strikes
6. The acceleration due to gravity at the surface of Mars is roughly 4m/s2. If an astronaut on
Mars were to toss a coin upward with a speed of 10 m/s. Find
a, how long it would rise
b, how high it would go
c, its speed at t =3sec
d,its displacement at t=3 sec
7. Two particles A and B at the same initial position, accelerate uniformly from rest along a
straight line. After one second particle A is 4m ahead of B. What is the separation of
particle A and B after 3 seconds from the start?
8. A baseball is thrown with an initial velocity of 50m/sec at angle of 150 above the
horizontal. How far the throwing point will the baseball strike the ground?
9. A projectile is fired from a gun located at 45m above the ground with a speed of
250m/sec horizontally. Find
a, how long does the projectile remains in air? Take g =10m/s2
b, at what horizontal distance does it strike the ground?
c, what is the vertical component of it velocity as it strikes the ground?
10. What minimum initial velocity must a rocket have in order to reach a target 1000m away?
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