Unsolved Problems
Q.1. If a car
is moving with a speed of 90 km/h for one hour and for next one hour car is
moving with a speed of 80 Km/h. Find the average speed of car in km/h and
meter/sec ?
Q.2. If a car
is moving with a speed of 54 km/h for one hour and for next one hour car
is moving with a speed of 34 Km/h. Find the average speed of car in km/h and
meter/sec ?
Q.3. If a car
is starting moving with a speed of 60 m/sec and if the acceleration is 4 m/sec.
Find the speed after 10 sec and also find the distance after 10 sec?
Q.4. If a car
is start moving from rest and get a speed of 50 m/sec. Find the distance after
10 sec?
Q.5. If a car
is moving with a speed of 54 km/h and after applying break the speed decreases
18 km/h in 5 sec. Find the acceleration.
Q.6. If a ship
cross a river in 40 sec with a average speed of 45 m/sec and return in 40 sec
with same speed. Find the distance covered by ship and also find the Average
Velocity of the ship.
7. A bullet of
mass 10 gram hits a target with 50 m/sec and stop in 0.02 sec.
a). The
distance covered by bullet before stoping.
b). Force
exerted by target on bullet.
8. A bullet of
mass 12 gram hits a target with 150 m/sec and stop in 0.04 sec.
a). The
distance covered by bullet before stoping.
b). Force
exerted by target on bullet.
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| science ncert solutions |
9. If a car is
moving with initial velocity of 108 km/h and sudden applying break and velocity
decreases to 54 km/h in 10 sec. Find the acceleration of car.
10. If a car is
moving with initial velocity of 144 km/h and sudden applying break and velocity
decreases to 72 km/h in 20 sec. Find the acceleration of car.
11. A body of
mass 90 Kg start moving from rest and covered a distance of 1600 mm. with a
acceleration of 20 m/ sec^2. Find final velocity of body and also find the
momentum of body.
12. A ball of
mass 350 g moving with velocity of 20 m/sec and hits another ball of mass 4kg
(rest). Find the combined velocity of balls after collision.
13. A car of
mass 70 kg moving with velocity of 20 m/sec for 20 sec and hits tree wall. Find
the distance covered by car and also find the impact force.
14. A ball of
mass 400 g moving with velocity of 20 m/sec and hits another ball of mass 4kg
(rest). Find the combined velocity of balls after collision.
15. A car of
mass 90 kg moving with velocity of 20 m/sec for 20 sec and hits tree wall. Find
the distance covered by car and also find the impact force.
16. If a car is
moving with initial velocity of 180 km/h and sudden applying break and velocity
decreases to 90 km/h in 10 sec. Find the acceleration of car.
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