Page 26 - Pra U STPM 2021 Penggal 1 - Physics

Physics Term 1 STPM Chapter 2 Kinematics
10. (a) An object in linear motion has an initial 13. (a) Define acceleration.
velocity, u. The object has an uniform Explain how it is possible for a body to
acceleration of a. When the displacement undergo acceleration when its speed
is s, the velocity is v. Define uniform remains constant.
acceleration and deduce the equation (b) A ball falls 2.00 m from rest and a further
2
2
v = u + 2as distance of 0.10 m as shown in the figure.
–1
(b) A car is travelling at 54 km h , and when 2
the car is 25 m from the stop line, the
traffic light turns red. The reaction time
of the driver is 0.60 s. 2.00 m
(i) Find the minimum deceleration of
the car for the car to stop behind the
stop line.
(ii) Sketch a graph to show how the
displacement of the car from the stop 0.10 m
line varies with time.
(c) A ball is kicked from the ground and
it follows the path shown in the figure Neglect air resistance, calculate
below. The greatest height reached is (i) the speed of the ball after falling 2.00 m,
2.0 m and the range in 22.0 m. (ii) the time to fall a distance of 0.10 m.

2.0 m
14. (a) Define velocity.
22.0 m
Explain how the displacement and the
Determine acceleration of an object may be deduced
(i) the velocity of projection of the ball, from a velocity-time graph.
(ii) the time of flight. (b) A trolley is placed at the top of a slope
as shown in the figure. A block is fixed
11. A car starts from rest and travels along a rigidly to the lower end of the slope.
straight road. The acceleration-time graph of
the car is as shown below.
Acceleration / m s –2

4

2

0 Time / s At time t = 0, the trolley is released from
2 4 6 8 10
the top of the incline and its velocity v
–2 varies with time t as shown below.
v
(a) What is the maximum speed of the car? A
(b) What is the speed after 10 s?
12. A missile is to be launched from a point P,
500 m from the peak of a hill of height
2000 m into enemy territory. If the missile C
is to just pass over the hill and strike a target O
1200 m from P, calculate
(a) the velocity at which the missile should
be launched, B
(b) the time of flight of the missile.
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