Constant acceleration
1. A body travelling at 5ms-1 accelerates at 20ms-2 for 100m. What will its final velocity be?
2. A body travelling at 2ms-1 accelerates to 8ms-1 in 2s. Find its displacement.
3. A body is thrown downwards with a velocity of l0ms-1. Assuming the acceleration due to gravity is
10ms-2 calculate its displacement after 2s?
4. A boy standing on the edge of a cliff throws a stone upwards with a velocity of 5ms-1. If the cliff is
50m high how much time does it take for the stone to hit the bottom of the cliff?
Projectiles
1. A ball is projected as shown in the diagram.
Formulae
1
‫ ݐݑ = ݏ‬+ ܽ‫ ݐ‬ଶ
2
‫ ݒ‬ଶ = ‫ݑ‬ଶ + 2ܽ‫ݏ‬
ܽ=
‫ݒ‬−‫ݑ‬
‫ݐ‬
‫=ݏ‬
(‫ ݑ‬+ ‫)ݒ‬
‫ݐ‬
2
(a) Draw a line showing the possible path of the ball.
(b) Calculate the vertical component of the balls velocity.
(c) Using your answer to (b) calculate the time of flight.
(d) Calculate the horizontal velocity of the ball.
(e) Using your answer to (c) and (d) calculate the balls range.
2. The ball above is projected with the same angle and velocity from a 10m high sea cliff.
Calculate the time taken for the ball to hit the sea.
© Chris Hamper, InThinking
www.physics-inthinking.co.uk
1